I've read what some of you have, and I like them. Here's what I would like to see in a pt. 4:
-An opening speech about mutation once again by Professor X, asking the question about when mutation started.
-Storm now runs the Xavier Institute and gets frequent visits from Beast. She, along with Collossus now lead the X-Men and are in the Danger Room training the new team: Kitty (Shadowcat), Bobby (Iceman), Warren (Angel), Jubilee, and Nightcrawler (who has returned to the mansion). Rogue is one the move once again, trying to clear her head (after taking the cure, most of her fellow mutants at the school act differently towards her and call her a "traitor"). Wolverine has left the mansion for reasons unknown.
-Alex Summers arrives at the school after he receives word about his brother's death.
-Meanwhile Professor X, in the body of that comatose man, is brought to the mansion by Moira where he explains to Storm and the others what happened and how he is still "alive". He wants to let them know that he is still well and that he won't be returning to the X-Men anytime soon, because he is on a "mission of self-thought" or some other mystical type journey that sounds just about right.
-It's shown that Magneto is underground after discovering his powers are slowly returning. He has been gradually trying to increase his power, but he is not getting much progress. Though his powers haven't returned yet, he still feels that he should let it be known that Magneto has returned, so he sets out to find two mutants who are apparently his children (since he has no one else to turn to) so they can deliver his message (also he is busy going through old scriptures from ancient Egypt that he has held for years, but only kept it for dire times, and these times are more dire than ever.
-Beast drops by the Mansion to discuss with the X-Men that the cure that was developed is not entirely permanent. In some mutants it is, but in others (such as powerful ones and some "lucky ones") it's not, and they all remember Magneto was hit with the cure as well. They believe he might indeed return if the same goes for him.
-Meanwhile, Rogue is still on the road and eventually stops at a bar (as always) and runs into a bar fight with five men against one (and we all know who that one is). The one man pulls out his only defense: a deck of cards....that happen to flare up and explode all over the place. Rogue realizes he's a mutant and the man runs off before the police show up (but not before stealing a kiss from Rogue....and her all her money). After realizing this, she follows him.
-Magneto, slowly gaining more power, travels over to the moutains where there is a home, belonging to Pietro Maximoff, his son. After telling him what his plan is, the two travel over to a mental ward where their is a girl who believes herself to have magical powers is kept in. Pietro and Magneto break her free, and she is revealed to be Wanda Maximoff, Magneto's daughter (he had seperated his children and kept them hidden so that when the day came for him to fall, they would rise and take his place).
Once three are reunited, they move on with their next plan: which is travel to Egypt to try and ressurect the one known as En Sabah Nur, who is believed to be the first mutant on Earth. It is said that Nur, "at his core, has always been about ensuring that the mutant race is strong enough to survive whatever hardships it might encounter". Now, after the events of X3, the mutant race is at its all-time low…so if there was ever a time where the mutant race needed a savior, it’s now. And Magneto intends for En Sabah Nur intends to be that savior.
Before they can move on, Magneto wasnt's to rebuild the Brotherhood, so he moves on to doing so (not before making his return known).
-The X-Men get word of Magneto's return and that he's breaking out various mutants to rebuild the Brotherhood, so they chase him down, with Havok and Beast on the team for the moment.
-Rogue finally finds the theif Gambit and she tries to get her stuff back, and when she touches him, he passes out (her powers are returning, and she now has a share of his). After seeing that her powers have returned, she decides to head back to the school (Gambit, after waking up secretly follows her). Once she arrives she realizes that the others have left, and most of the other mutants don't want her around. She begins having a breakdown and Gambit tries to comfort her, and surprisingly: she begins to exhibit new abilities (apparently a side effect of the cure wearing off).
-The X-Men return to the mansion after discovering where Magneto is heading to and for what (after consulting the Professor) and are joined by Rogue and Gambit on the mission because they'll need all the help they can get. There is tension between Bobby, Rogue, Kitty, and Gambit (Rogue still likes Bobby, but she is liking Gambit, and Bobby's jealous, which is angering Kitty).
-In Egypt, Magneto and his team meet with a mysterious man who calls himself Sinister and he takes them to meet a woman named Destiny who can see into the future and she tells them of the events to come, Apocalypse, and the Four Horsemen. With this information, Sinister joins the team towards the tomb of En Sabah Nur.
-The X-Men find the where the Brotherhood has arrived at they begin battle, splitting the teams while some go inside to try and resurrect the first mutant/stop the ressurection. Of course it's not stopped and Apocalypse is awaken and he begins atacking, knocking out a number of the X-Men and Brotherhood. He then takes four of the mutants and chooses to make them his Horsemen (Collossus, Storm, Magneto, and Angel). Also, Angel is stripped of his old wings and given new metallic ones.
-Now the remaining mutants have to join together and stop the Four Horsemen and Apocalypse as they ramapge through cities and civilizations (it can end like that or end with them defeating Apocalypse....don't matter)
How's that sound?