|In the DWU|
|Main roles:||Mark Grantham, Tarak Ital|
|Notable non-DWU work:|
Chook Sibtain played Mark Grantham in The Sarah Jane Adventures story Warriors of Kudlak. He also played Tarak Ital in the Doctor Who television story The Waters of Mars, David Brock in the Big Finish Doctor Who audio story The Feast of Axos, Athrid in The Acheron Pulse and Brian in Technophobia.
- Internet Movie Database at the