Superman III

Synthetic kryptonite laced with tar splits Superman in two: good Clark Kent and bad Man of Steel.

Director: Richard Lester

Cast:Christopher Reeve , Richard Pryor , Margot Kidder , Jackie Cooper , Marc McClure , Annette O'Toole , Annie Ross , Pamela Stephenson , Robert Vaughn , Gavan O'Herlihy , Nancy Roberts , Graham Stark , Henry Woolf , Gordon Rollings , Peter Wear , Justin Case , Bob Todd , Terry Camilleri