Tennant starred in Doctor Who from 2005 to 2010, while Piper first appeared in 2005 opposite Christopher Eccleston, who played the ninth Doctor.

BBC: Doctor Who plea after US DVD error

After a TV movie in 1996 - starring Paul McGann - the TV series returned in 2005 with Christopher Eccleston in the lead role.

BBC: New Doctor Who Matt Smith hopes series will 'thrill'

The leak involved one 45-minute episode called Rose, which is the name of the Doctor's assistant played by pop singer Billie Piper (pictured with the Doctor, Christopher Eccleston).

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