John Jones (Martian Manhunter)
More to come...


Bart Allen (Flash)
More to come...


Arthur Curry (Aquaman)
More to come...


Victor Stone (Cyborg)
More to come...


Professor Milton Fine (Brainiac)
Played by James Marsters



Episode Appearance(s): Arrival, Aqua, Thirst, Splinter, Solitude, Hypnotic
Powers, and how he got them: A form of Artificial Intelligent with similar powers to that of Clark's (Speed, Strength) and the ability to morph parts of his body into sharp objects. His actual body is a crystallized black aquaeous form, therefore he can probably change the way he looks too if he wanted. It's presumed that in the Smallville continuity, Zod created him, although in the comics, he is not of Kryptonian origins. Also, on the show he currently has 3 other duplicates of himself.
How he died/left the show: He is the first villain to make more than a 2 episode repeat on the show. First time he had a confrontation with Clark; in the FOS, he seemed to have died due to have a crystal pierce his chest. He however has returned and his current whereabouts are all over the place as he is collecting some form of a virus.

Lucy Lane
More to come...



General Sam Lane
Full Name: General Samuel Lane
Episode Appearance(s): Mortal



Lillian Luthor
Played by Allisen Down



Episode Appearance(s): Memoria, Scare, Lexmas, Void



Lucas Luthor
Full Name: Lucas Dunleavy Luthor
Episode Appearance(s): Prodigal



Countess Isobel Theroux
Played by Kristin Kreuk

Full Name: Countess Marguerite Isobel Theroux
Episode Appearance(s): Spell, Sacred, Commencement
How she left the show: Isobel resurfaced for the last time when Lana was being strangled by Genevieve Teague and used the Air Stone to stab Genevieve in the heart. Once Isobel had her revenge on Genevieve, she freed herself from Lana and the Lana's tattoo (mark of Transference) was disappeared.



Genevieve Teague
Played by Jane Seymour



Episode Appearance(s): Bound, Pariah, Krypto, Ageless, Forever, Commencement
How she left the show: Isobel used the Air Stone to stab her in the heart with it, thus avenging Isobel's death and putting her to rest for good.



Dr. Bridgette Crosby
More to come...



Dr. Teng
Full Name: Dr. Lia Teng
Episode Appearance(s): Phoenix, Velocity, Obsession, Resurrection, Crisis
How she died/left the show: Lionel threatened to send her back to the country where her own people would punish her for working with the Americans. Adam Knight killed her.



Adam Knight
Played by Ian Somerhalder



Full Name: Adam Knight, Chad Nash
Episode Appearance(s): Asylum, Whisper, Delete, Hereafter, Velocity, Obsession, Resurrection, Crisis



Perry White
Played by Michael McKean



Full Name: Perry "Bulldog" White
Episode Appearance(s): Perry
How he left the show: Inspired by heroic example, Perry vowed to change and returned to Metropolis to rebuild his career. He encouraged Clark to stick with his interest in journalism and promises to help him out if he ever comes to Metropolis.



Dr. Virgil Swann
More to come...



Henry Small
More to come...



Moira Sullivan
Played by Lynda Carter



Episode Appearance(s): Tomb, Progeny
How she left the show: Moira is taken into Oliver Queen's protection in Star City.



Gabe Sullivan
Full Name: Gabriel Sullivan
Episode Appearance(s): Jitters, Obscura, Tempest, Dichotic, Covenant, Gone



Aunt Nell
Played by Sarah-Jane Redmond



Full Name: Eleanor Potter Winters
Episode Appearance(s): Promise



Laura Lang
Played by Wendy Chmelauskas

Full Name: Laura Potter Lang
Episode Appearance(s): Pilot, Scare, Void
How she died/left the show: She and her husband were struck by a meteor and killed right in front their daughter, Lana.



Lewis Lang
Played by Ben Odberg

Episode Appearance(s): Pilot, Scare, Void
How he died/left the show: When the 1989 meteor shower hit, he and his wife were coming back from the homecoming game. They were struck by a meteor and killed right in front of Nell's and three-year-old Lana's eyes.