Toshiko Sato

Toshiko "Tosh" Sato (born 1975) was Torchwood Three's technicians expert, after having previously worked for the Ministry of Defence. Beautiful, brilliant and insecure, much of Tosh's private life remained mysterious.

Tosh worked at the Lodmoor Research Facility, run by the British Ministry of Defence. Blackmailed, with her mother's life at stake, Tosh stole plans to make a sonic modulator and successfully built one, even though the plans were faulty. She was arrested by UNIT and held indefinitely without trial, and then saved by Jack Harkness. He offered her a job with Torchwood as an alternative to spending the rest of her life in a UNIT holding cell.

She was a computer genius and arguably the most intelligent member of the Torchwood team. Despite her intelligence, she was insecure and not very confident in her abilities. Tosh was in love with Owen Harper but because of her insecurity, she found it hard to tell him how she felt.…more