Screen Rant

X-Men: First Class was originally meant to be a Magneto solo movie. 1 / 7

A string of delays and issues forced the Magneto film to be canned. 2 / 7

X-Men: First Class would use elements of its script. 3 / 7

Zack Stentz is one of the writers of X-Men: First Class... 4 / 7

And he revealed that Mister Sinister was originally the villain. 5 / 7

Mister Sinister was meant to be the villain of the Magneto movie... 6 / 7

But he was replaced by Sebastian Shaw and the Hellfire Club in X-Men: First Class. 7 / 7