The CW have released the following two promotional images from the April 29th episode of Smallville entitled "Dominion" which features the return of Callum Blue as General Zod

ZOD (Callum Blue) RETURNS IN JUSTIN HARTLEY'S DIRECTORIAL DEBUT EPISODE - Tess (Cassidy Freeman) learns that General Slade was found unconscious on a street corner, proof that someone has gained access to the Phantom Zone's escape portal and sent him back. Clark (Tom Welling) decides to return to the exiled land to make sure other phantoms are not fleeing and is furious when Oliver (Justin Hartley) tricks Clark into taking him along. With Clark's powers gone, the two are immediately captured by the Zoners who take them to their new leader, Zod (Callum Blue), who is thirsting for revenge on Clark for banishing him to this Kryptonian jail. Meanwhile, Lois (Erica Durance) learns Clark trusted Tess with a secret, but didn't tell Lois. Justin Hartley directed with story by John Chisholm.

"Dominion" airs on Friday, April 29th at 8pm EST on the CW.