Sergei Siberia (Russian: Сергей Сибирь) appeared in the episode "Super Agent Much?". He was a cyber-thief who was hired by Geraldine Husk to test Geraldine's new nano-technology. He spoke with a thick Russian accent.
He makes a cameo in "Evil Jerry".
- He has a video game obsession.
- He is seen sharing a prison cell with Lester Crawley in "Attack of the 50 Foot Mandy".