 Gene Hackman (qv) initially balked at wearing a skull cap to  portray the bald Lex Luthor, preferring instead to wear a series of  increasingly silly wigs, designed to point out the obviousness of  Luthors baldness. Hackman eventually relented, agreeing to wear the  skull cap in one scene, his last in the picture. The wigs worn by  Luthor throughout the film are visible in his underground lair  during the bathing sequence.