Ha! Is there a movie that covers this premise, and please tell me it's a comedy.
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Eh...played for drama in Xiaolin Showdown.
In an early episode, the cast finds a time-travel magical doodad and the bad guy gets control of it, which is...not good. Dude is smart enough to realize that his future self would have encountered all the other magic doodads and therefore knew where they'd be before the good guys' magic radar could find them. So he brings in his distant future self to lead him to the doodads and help him steal them without the good guys' interference. One of the protagonists momentarily gets control of the doodad and decides to bring in his own future self as a hard counter to distant-future-badguy. Eventually everyone is sent back to their own time, with goodguy sending the time-travel doodad to the future with distant-future goodguy for safekeeping.
Near the end of the series, this same goodguy gets the bright idea to get the timetravel doodad from his future self, and decides that the best way to do so is to use another magic doodad to freeze himself for a few decades. ...He unfreezes to find that the future went to crap while he was gone, and is eventually informed just how stupid his plan was due to his failure to think it through. He'd made the mistake of thinking of his future self as a separate entity rather than...well, himself. By putting himself into stasis, he changed the timeline to one where he'd spent those decades in stasis rather than growing older and more experienced. As such the future self he'd met literally could not exist. Consequentially, that retconned the early episode so that the bad guy won, kept winning, and eventually took over the world. After that, you know the drill, standard "fix the future you screwed up" plotline.