While Ryan Reynolds got to play Deadpool originally in X-Men: Origins Wolverine, the script writers ended up messing that one up horribly horribly wrong at the end. Luckily second chances were made, so Deadpool got his own real movie which ignored the events of what happened to him in the original movie timeline. And because they let Ryan Reynolds kind of roll with it, fans got the movie they really deserved. Now Wade Wilson is back!
After some very Deadpool shenanigans, Wade Wilson hits a low point in his life. He's recruited by Colossus for a new problem. Which also reunites Deadpool with his not-so-friendly ally Negasonic Teenage Warhead. A teenage mutant with explosive powers causing trouble, and Deadpool becomes a X-Men trainee to help de-escalate the problem.
Except he messes the whole situation up. Him and the much younger mutant are sent to a very bad prison for mutants with heavy neck devices that prevent them from using their powers. However a deadly mutant from the future named Cable breaks into the prison with one goal. to kill the chubby little punk.
Deadpool manages to stop Cable from doing so at first. But he knows he's coming back to finish the job. So Deadpool starts his own gender neutral X-Men-ish team of misfits to stop Cable from doing so. But with such a stupid leader, can they really protect this young man's life?
Overall Deadpool 2 is about on par with the original film, though this one does things worse and better than the original film in different ways. Deadpool is still very funny, though some of his jokes try too hard and fall flat. The first third of the film could have been better, but once Cable arrives on the scene, it's almost all pure awesome. I also would like to add that I really liked the new characters Cable, Domino, and Yukio very much.