Max Eisenhardt (aka Erik Magnus Lehnsherr, alias Magneto) is a comic book character in the Marvel Comics series. Magneto first appears in X-Men #1 in 1963. Magneto is a mutant with the ability to control Magnetism. While Magneto's powers were first thought to be evil, the reality of his charachter was that he was a Holocaust survivor whose obsession was to protect the mutant race, much as he wished there were people protecting the Jews from those horrific times.
In film, Magneto is played by Ian McKellen. The next X-Men film will debut in May of 2009 X-Men: Origins Wolverine. The next X-Men film will be X-Men: Origins Magneto and is expected in 2011.