Smallville guest stars: 

Christopher Reeve appears twice as Virgil Swann 

Terence Stamp, Zod in the 70s movies, voiced the disembodied spirit of Jor-El, 

Margot Kidder - 70s film Lois - Bridgette Crosby 2 episodes 

Helen Slater - 80s movie Supergirl - Lara-El , Krypton birth mother of Superman - 3 episodes

 Lynda Carter - 70s TV Wonder Woman - Moira Sullivan - one episode

 Dean Cain - 90s TV Superman - Dr. Curtis Knox - one episode .