Definately should be called "X-men: Genesis" and each season should have like a villian of the year. I'd like the series to start with the original 5 X-men (Cyclops, Jean, Beast, Iceman, and Angel) then introduce the signature characters after. Here is how the series should go:
Season 1
-We are introduced to the main 5 X-men with Professor X as their mentor.
-Villian of the Year: Magneto
-Magneto begins his war on humans.
-Senator Kelly brings the issue with mutants to the table.
-We are introduced to the Brotherhood with Mystique, Toad, Sabertooth, Pyro, and Avalanche.
-We are introduced to Juggernaut.
-Wolverine, Storm, and Nightcrawler are introduced in their individual episodes and become the newest recruits.
Season 2
-Villian of the Year: Mr. Sinister
-After the last season's conflict with Magneto, Bolivar Trask is brought in to put Sentinals into production.
-The Friends of Humantiy are introduced along with Creed and Bastion.
-Cyclops and Jean grow closer in their relationship as Wolverine develops feelings for Jean.
-We are introduced to the Morlocks.
-Storm meets Callisto and they both battle for leadership of the Morlocks.
-We are introduced to the Maraudars.
-Rogue, Forge and Gambit are introduced in their own individual episodes and become the newest recruits.
-Sinister leads Maraudars in his infamous attack against the Morlocks leading the X-men to stop them.
Season 3
-Villian of the Year: Dark Phoenix
-The X-men's latest mission causing Jean to get possessed by the Phoenix.
-The Shi'ar Empire as well as D'Ken, Deathbird and Lilandra are introduced.
-The Phoenix leads the X-men on a mission to stop D'Ken from using the M'Kaan crystal.
-After that battle, the Hellfire Club is introduced and Sebastian Shaw uses Jean's vunerablity to make Phoenix his queen.
-Emma Frost becomes jealous and tries to confront Phoenix but loses.
-The X-men stop the Hellfire Club, but Dark Phoenix is now out of control.
-Dark Phoenix plans to destory the whole world by buring it up.
-The X-men confront her for the last time but the Shi'ar intervines.
-They capture Jean and plan to destory her unknowingly byt the X-men.
-Colossus, Banshee and Jubilee are introduced in indiviual episodes and become the newest recruits.
Season 4
-Villian of the Year: Apocalypse
-Jean mysterious returns and falls from the sky.
-The X-men wonder what happened to her as there is no trace of the Phoenix.
-Professor X tries to contact Lilandra but there is no word from them.
-Jean plans to make up for her past and wants to do good again, but her strange behavior has the team worried.
-Mr. Sinister returns and seems to be creating an army of advanded robots using Sentinal technology.
-Magneto and Mystique also return but have strange Egyptian symbols on them and are woking for Sinister.
-The rest of the Brotherhood return with Scarlet Witch and Quicksilver asking the X-men for help to find Magneto and Mystique.
-Angel is upducted from his home by Mr. Sinister.
-Beast uncovers some interesting information from Hellfire Club about the first mutant who ever lived, Apocalypse.
-Jean is still Dark Phoenix and is a Horseman.
-Angel returns as Archangel, the Horseman of Death and plans to kill the X-men.
-Magneto and Mystique are the other 2 horsemen.
-When Apocalypse finally rises, The X-men and the Brotherhood plan to stop him and his horsemen.
-Psylocke, Shadowcat and Sunfire are introduced in their individual episodes and become the newest recruits.
Season 5
-Villian of the Year: Legacy Virus
-A cure for mutants is found and all mutants are divided on the subject.
-Rogue wants to take to touch people again, but doesn't want to disappoint the X-men.
-Gambit grows closer to Rogue and encourages her to do it.
-A mutant from the future named Bishop comes to warn the X-men about mutants being extinct in the future.
-The twist is the cure was never a cure at all, but a deadly virus created by Mr. Sinister.
-As dozens of mutants fall ill, as well as Rogue, Beast plans to find a cure to the virus.
-The X-men race to stop Mr. Sinister once and for all.
-Cyclops kills Mr. Sinister in battle.
-Marrow is introduced and the surviving Morlocks of the massacre become Gene Nation.
-Marrow and her Gene Nation plan to kill all surface dwellers after one of the Morlocks fall ill because of the virus.
-Storm almost kills Marrow after trying to stop Gene Nation.
-Polaris, Haovk, and Magma are introduced in thier individual episodes and become the newest recruits.
Season 6
-Villian of the Year: Onslaught
-The X-men are must stop an out of control mutant with almost unlimited power just as Cyclops and Jean discover the mutant is their son from an alternate reality, Nate Grey.
-Magneto comes to help the X-men and tells them that he has reformed from his evil ways.
-During the battle against Nate Grey, Professor X and Magneto's minds become linked, and Onslaught manifests from it.
-Kidnapping them both and taking the form of Professor X, Onslaught plans to destory X-men because of his hatred toward them.
-We are introduced to other Marvel heroes who come and help the X-men stop Onslaught.
-The X-men find out if they destory Onslaught, they kill Professor X and Magneto as well.
-The X-men make a tough decision as they must kill the the greatest man they have ever known to save the world.
-Emma Frost, Dazzler, and Longshot become the final members of the X-men.