Theobald is the one-time comedy partner of
Russell Brand; they formed a double act during the 1990s called Theobald and Brand on Ice. This has been mentioned by Brand on his
BBC Radio show and in his autobiography,
My Booky Wook. As well as appearing in
Green Wing, Theobald has written comedy for the television programmes
The Sketch Show and
Smack the Pony. He also appeared in the radio sitcom
The Exterminating Angels. In 2008, Theobald joined the cast of
ITV science fiction series
Primeval as
Oliver Leek. He appeared in the 2010 film
Get Him to the Greek, alongside Brand, playing his assistant. In 2014, he starred in the independent British feature film
Downhill, with
Ned Dennehy,
Jeremy Swift and
Richard Lumsden, which is a comedy about four men attempting
Alfred Wainwright's
Coast to Coast Walk. The film is directed by James Rouse and the screenplay was written by
Torben Betts. ==Film and television==