The first film clip from X-Men: First Class has arrived, which see Charles Xavier (James McAvoy) trying to convince a bunch of government types that the power of mutants are more than just tricks, with a little help from Mystique. In the film, James McAvoy and Michael Fassbender star as young versions of Charles Xavier (Professor X) and Erik Lenscherr (Magneto), who were friends before becoming enemies, and as this trailer shows, had a lot to deal with in the 60s, when a new species of mutants was emerging and the world was on the precipice of nuclear war. It hits cinemas on June 1st.