I've already posted this, this is a re-post with some edits and a LOT more detail.
Easily X-Men.
My X1 would feature Professor X recruiting the 5 original teenage X-men, Cyclops, Jean Grey, Angel, Beast and Iceman, facing off against the original Brotherhood, Magneto, Quicksilver, Scarlet Witch, Mastermind and Toad. Mutants would still be like an urban legend, the kind of story you tell kids to scare them, although the government knows they are very real.
The movie would open in London with an unknown male being chased by an angry mob, next thing the crowd just stops and seem to be distracted by something the viewer can't see, we cut to Mastermind controlling the mob by creating an illusion to distract them, the male being chased is revealed to be Toad, we hear a voice from an unseen male saying "Are you ready to take your rightful place in this world?" Obviously it's Magneto.
We cut to a government defence briefing involving the president, government officials Bolivar Trask and Henry Gyrich are informing the president about the mutant problem, the president refuses to believe it, they show him video footage of a secret program called Weapon X, where they have been using mutants on covert operations, even experimenting on some. They mention this guy who can absorb energy then fire it right back at you,how they used to have a guy who shoots red beams from his eyes, and then they say "we've got this one guy, a Canadian, we literally cut this guy open every day, and the next days he's fully healed!" The president authorises precautions to be taken, we see drawings of Sentinels in the background.
Hank and Bobby attend the same school, Hank being roughly 17 and Bobby 15, Hank being the gentle giant he is, is quite popular in school although everyone talks behind his back about his huge gorilla like form,, he's a really nice guy and a genius, Bobby, a laid back, funny kind of loser, envies guys like Hank, he isn't to popular but is very confident, he's been unwell lately, he's always so cold and everything he touches turns to ice, his parents don't know what's going on, but they love their son, they keep his 'illness' quiet and let him stay home from school during this period.
The first time we see Professor X, he's visiting the Grey family, a married couple with a daughter named Jean who is 17, beautiful inside and out, Jean is in full control of her powers already and we find her using her telekinesis out in the garden, cut to a huge speech from Xavier about how he can help her use her powers for good, how he can help all gifted individuals, during this speech we see scenes of Jean using her power, Hank doing some pretty impossible gymnastics alone at the school gym after dark, Bobby is trying to focus his power in the garage at home, causing a mini blizzard, and then we get our first glimpse of Warren, he's in a fancy bedroom, dressed in jogging bottoms, he puts on a hoody, it's noticeable the back of the hoody is cut out, he puts it on in an awkward manner, he puts on a ski mask, when he turns we see this pair of amazing wings on his back, he jumps out the window and flies off into the night, the final cut scene would be Bobbys garage knee deep in snow with Bobby nowhere to be seen, we see some snow slowly start to stir, Bobby then stands up and we see him in his original snow form, he looks around then looks at his hands and himself, "YEAH!" is his only word. Xavier finishes his speech and asks Jean would she like to attend his school, she smiles and says "yes, it sounds lovely".
Jean and the Professor visit the Drakes and recruit Bobby and then recruit a reluctant Hank, the 4 then head to the mansion, the 3 teens are immediately impressed with the size of the mansion and are obviously excited, we now get our first glimpse of Cyclops, he's obviously just been working out, he greets the new students in a very serious manner, he's a sullen sort of guy with not much of a sense of humour, it is obvious he's attracted to Jean as soon as he sees her, the team are given a tour of the mansion and are briefed by Cyclops on 'what it means to be an X-Man', he's obviously a bit of a square, we get to see the Blackbird and Danger Room in the tour scene.
We cut to Magneto and the brotherhood, they're making bombs, Magneto keeps nit picking on everything Pietro does, constantly belittling him, every comment Magneto makes about 'Human scum', Pietro immediately agrees with, begging for his fathers approval, he never finds it. It becomes apparent Mastermind is quite scared of Magneto, as is Toad, although Toad is devoted to the Brotherhood as well, he's always been persecuted by 'normal people' due to his odd form, so he relishes a chance to teach Homo sapiens a lesson. They are all scared of Magneto, he angry and bitter, he dishes out a speech about the coming changes for Homo Superior he's holding a newspaper in his hand, he throws the newspaper on the table and we see an article about an upcoming public speech the president has planned.
Back at the mansion Scott and Jean are talking and there is an obvious attraction between the two, Scott tells her he and his younger brother were orphaned at a young age, his brother was always in foster care whereas Scott was in a children's home, believing this to be the fact he always had to wear dark sunglasses and didn't appear normal, he's starts to tell her about a section of the 'army' he joined when Professor X mentally tells the X-Men to prepare for their first mission, we then see our 4 X-Men in uniform.
They are on the way to try and recruit Warren, he's a hard man to approach in normal ways, he's heir to Worthington Industries, a multi billion dollar corporation. They have to try and catch him mid flight at night, he's initially reluctant, he can be awkward to talk to, he's a pampered, little bit snobbish kind of guy. He agrees to attend the school the next day to see what it's all about.
The next morning in Washington The president is addressing the nation with a speech about how the world is changing and how we as human beings should be ready, he can't actually say mutants exist, but he's readying the nation. Magneto and the Brotherhood are in Washington, during the speech Magneto reveals himself as a mutant, with a barrage of bullets fired at him by the presidents bodyguards and security, he stops every one, and drops the bullets to the floor. He reveals to the camera all about the existence of Weapon X and the manipulation of 'his people', he exclaims Homo sapiens are monsters, if Weapon X isn't shut down within 24 hours and the humans responsible for its existence put to death, he will set off a bomb in Washington and kill the President. Magneto knows his demand for death of weapon x personal isn't gonna happen and that Weapon X won't be shut down, he wants to stage an attack, he wants humans to hate mutants to help further his own cause, be easier to recruit new brotherhood members if everyone hates mutants.
Cut to the mansion with Professor X and now the full 5 X-Men are watching the events on tv. Here is where we reveal the backstory of Professor X and Magneto, how they were friends, and how 2 years earlier they planned to make a team to combat any mutant threats, Charles wants peace, whereas Magneto feels that mutants are the rightful heirs to the world. They learn of the weapon X program, the 2 of them along with Magnetos children, Wanda and Pietro stage an attack on the Weapon X facility, freeing many mutants in the process, (a nice chance to cameo some throwaway mutants) a lot of these mutants are angry and hysterical after being imprisoned for so long and go on a rampage, killing any weapon X worker they find, Charles finds Magneto joining in the killing spree, they have words, and Magneto sends a metal shard through Professor Xaviers spine, crippling him, claiming he knew this day would come, then Magneto leaves with his children and Mastermind who was a weapon X prisoner, Charles realizing he has made a powerful enemy and a huge mistake in coming here just lies on the floor, amidst the chaos we see a weapon X prisoner pick Charles up, put him on their shoulder and head for the exit, it's revealed to be Cyclops.
Professor X is wise to Magnetos plan, 24 hours later the brotherhood set off a bomb, killing a quite a few people and destroying some of Washington. The Presidents knee jerk reaction is to go ahead with 'Project Nimrod', The release of Sentinels to destroy the brotherhood. The president doesent realise that the Sentinels can't target specific mutants and will destroy any mutant it locates, the Sentinels kill a few random mutants before both the Brotherhood and X-Men arrive to combat them.
Mastermind is killed during the battle, not realising his illusions won't work on machines. Jean and the Professor use their minds to locate Trask, once they find him, they mind rape him to find out where the sentinel base is, Quicksilver is sent with a bomb to destroy the base ending the Sentinel threat, which he does.
Upon Quicksilvers return we find Magneto towering above a naked, quivering President, with a gun to his head being controlled by Magnetos power, Magneto is ranting and raving like a lunatic about mutant supremacy, he comes across really angrily insane. Toad seems to be enjoying the show, whereas Scarlet Witch and Quicksilver realise there is no going back from this, Quicksilver speeds past Magneto removing his helmet, if only Magneto would have been nicer to his son, cue psychic attack from Professor X. During the psychic attack, Quicksilver picks up Scarlet Witch and speeds away, Toad realising he's now stood alone, discreetly slips away, Magneto is unconscious and taken into custody.
Professor X comes to an understanding with the President and actually get secret funding from the government.
The movie would end with the X-Men going to the Savage Land to locate a powerful, potentially dangerous mutant located by Professor X using Cerebro. The X-Men are then attacked with a pinkish energy blast from an unseen force, the team ready for a new battle.
X2 begins with Professor X recruiting a new team to rescue the original X-Men, after he lost contact with them weeks ago, this new team being the second genesis team from the comic, Xavier realising recruiting just teenagers wasn't his best idea, recruits an age diverse team, Wolverine an aggressive, moody, alpha male who is God knows how old, we find him in a bar enjoying a quiet life, he tells Xavier about his time at the Weapon X program, and even though it ended badly, he misses the excitement of missions, he's in.Storm who is about 20, we find somewhere in Africa, she's slightly arrogant but her hearts in the right place, she's worshipped by her tribe because she brings rainfall during the dry season, she's worshipped as a God although she knows she's a mutant, she is very reluctant, it kind of fells like Xavier might have messed with her mind to agree to join the team. Banshee is a mid thirties Irish man with no direction in life, he's to laid back, nothing bothers him, he lives in a little village in Ireland and has nothing in his life but an ex-wife and a daughter who wants nothing to do with him, he joins no question asked. Nightcrawler a 19 year old is part of a German circus, he is playful and a bit of a religious fanatic an feels like he was meant for something greater, an offer of a spot on the X-Men could be his greater calling, he's in. Colossus, a 22 year old Russian, a very loyal gentleman, having seen the events of the last film on the news has been saving for a flight to New York, he wants to make his family proud, he volunteers for the team. Sunfire (in his late twenties) reluctantly joins the team and it feels like Xavier mind controlled him to join, he's angry and moody. Thunderbird, early thirties, an Apache is keen to make his tribe proud, he joins no problem, he's got quite the ego, believing himself better than the rest.
The team is briefed, given costumes and code names, and then sent to the Savage Land.
The unknowns responsible for the original teams capture are revealed to be Mr Sinister and the Marauders, Arclight, Sabretooth, Vertigo, Scalphunter, Harpoon and a reluctant Gambit. It's touched upon that Gambit is in Sinisters debt, and he's not there by personal choice. The rest of the Marauders are just evil jerks who love getting paid to be bad. Mr Sinister is a genius scientist.
The X-Men arrive at the Savage Land and begin exploring, Professor X has given them rough co-ordinate but they aren't exact as something is blocking his telepathy (Sinister and some pesky machine he's built), they encounter Gambit, Sabretooth and Harpoon, they are told to leave or die. When Wolverine and Sabretooth see and recognise each other all hell breaks loose, it becomes apparent they were both volunteers for the Weapon X program, although Sabretooth betrayed Wolverine and killed the woman he loved, then led Wolverine into the trap that caused the horrific adamantium bonding process, Sabretooth did this out of jealousy of Wolverine, probs tell this over a few flash backs. Both of them attack each other in a murderous frenzy, completely ignoring their mission, completely ignoring their teammates and they disappear off screen fighting, cut to Banshee saying to Nightcrawler "Knew something wasn't right about him"' cut to Harpoon saying to Gambit "Knew something wasn't right about him". In the confusion Gambit and Harpoon retreat.
We cut between scenes of the X-men exploring the Savage Land and encountering Marauders, and Wolverine and Sabretooth in a bloody never ending battle. This battle would take place the entire movie, with the rest of the films plot going on and the team finding the original X-Men, just every now and again cut back to them two still fighting, after like cut 4 to them it would just be funny, and at the final cut, just them two, exhausted, throwing half hearted punches at each other with heavy breaths. During the rest of the X-Mens battle with the Marauders, Thunderbird is killed by Harpoon and Scalphunter.
When the new X-Men find the original 5 they learn that Sinister has been genetically experimenting on them, augmenting their powers to see the potential, we find Beast now in his furry blue form, Angel has changed, his feathered wings now replaced with razor sharp metal ones, and Iceman has lost his snow form (that's how I'd portray him in X1 as a nod to the comics), with it now being replaced with an ice form. Cyclops and Jean are the only two who's appearance hasn't changed although sinister has been taking blood samples from them.
At this point Sinister makes his escape, abandoning The Marauders.
With both X-teams now together, The remaining Marauders are defeated, Gambit approaches the X-Men in a cheeky manner, throughout the film they suspect he's not like the other Marauders through their interactions, the X-Men learn from Gambit that Sinisters strings are pulled by a higher power, Apocalypse, and Apocalypse wants a new world order, one that is run by him.
The X-Men destroy all forms of transport owned by the Marauders and leave them stranded in the Savage Land, the X-Men plus a reformed Gambit head home, as they board the Blackbird they can hear a knocking on the jet coming from outside, they open the door to find Wolverine, covered in blood, costume tore to shreds, without a scratch on him, he's smoking a cigar and says " aren't you forgetting something?" Then hops on board.
Mid-credits cuts back to Sabretooth and Wolverine in the Savage Land, they're both just exhausted, both smoking cigars, and just sat there, they notice Sinisters jet in the sky, look at each other, and Sabretooth says "I think that's my ride", Wolverine nods and they both walk off in different directions.
X3 has all the X-Men from the Savage Land return to Xaviers to inform Professor X about Apocalypse, obviously Professor X already knows about Apocalypse because he's Professor X, so he's been busy recruiting more mutants for the impending battle, here we meet Shadowcat, Jubilee, Havok (Cyclops' brother), Cannonball, Multiple Man and Forge.
The Brotherhood has to step up to to fight alongside the X-men, Since the first film, Quicksilver and Scarlet Witch have left the team, Toad, wanting to carry on the Brotherhood recruits a new team Blob, Avalanche, Pyro and a reluctant Rogue are new to the Brotherhood, under the guidance of Magneto, but he's supposed to be in a plastic prison somewhere, right? Well it ain't really Magneto, it's Mystique.
With these mutants coming to terms with having to work together, a mysterious mutant attacks them, a mutant with an M scar over his right eye, trying to kill Angel and Sunfire, the X-Men fend off this mutant who is revealed to be Bishop, he claims that "ArcAngel" and Sunfire serve Apocalypse, just then Angels and Sunfires eyes flash to white, they utter some phrase in an unknown language, attacks some X-Men then fly away escaping. Turns out Mr Sinisters experiments on Angel were more than just experiments, Sunfire was turned before he joined the X-Men, although neither mutant knew it we've just met Apocalypses first two Horsemen, Death and Famine.
Bishop tries to explain to the X-Men about Apocalypse and the coming battle, saying a little girl told him, out from the shadows steps Layla Miller, a mutant who just knows stuff.
(I wouldn't have Bishop as a time traveller, probably not even feature time travel at all in this series of movies)
Cut to Sinister in Egypt, Middle of the desert at a crumbling pyramid. He's talking to Apocalypse, beside Apocalypse is Gazer, his Horseman War.
Apocalypse is thanking him for rounding up "slaves" to be his Horsemen and assures Sinister a place in his new world. ArcAngel and Sunfire appear, Apocalypse claims he can now start his war, now that all his Horsmen are here, only then does Sinister realise he's been betrayed, his eyes flash to white he utters a phrase in an unknown language, he's Apocalypse newest slave, his Horseman Pestilence. (the Horsemen would be mindless slaves to Apocalypse, no emotion, no personality).
Our rag tag band of mutants back at Xaviers realise they could use Magnetos help in this, so they decide to break him out of his plastic prison, only a handful break him out, upon his return to Xaviers, Bishop immediately punches Magneto in the face, claiming he was in prison during Magnetos attack in X1, fellow inmates, aware that Bishop was a mutant, carve an M on his face. He's says it's Magnetos fault humans hate them, Magneto smiles.
The four Horsemen begin a campaign of terror, slaying anybody who gets in their way, each attacking from a different corner of the globe, the army are helpless and plan on nuking the attack sites, Professor puts a mind block on government officials world wide to prevent this, he's confident his X-Men can stop the Horsemen without nuking an entire area of innocent people, this causes a great strain on him, he's out of the battle.
The mutants split up into 5 different groups, 4 groups for the Horsemen, 1 group for Apocalypse.
The team facing Apocalypse would be Jean, Magneto, Wolverine, Pyro and Storm, the battle would be tough, with Jean eventually unwittingly unleashing the Phoenix Force onto Apocalypse, killing him, once he's dead the Phoenix force would subside with Jean regaining control of her body, and she just exclaims "What the hell was that!?".
Magneto discreetly escapes on his own, the separated brotherhood members do the same.
The movie ends with the X-Men back at Xaviers pondering what's next for mutants.