His promise comes true when he kills the Marauders clones except for Sabretooth. Magneto then clones the original Marauders so they can be used at his beck and call when the time comes.

Did you know that Wolverine never actually killed Sabretooth at the end of Fox's ... life and that the only reason he worked with Magneto in the first film was because Magneto offered Sabretooth ...

Now, though, it's been confirmed that Sir Patrick Stewart and Sir Ian McKellen will return as Professor X and Magneto in Avengers ... donning Magneto's iconic helmet has us all sorts of excited.