Doctor Who Companion to be killed off!

Hints dropped throughout the series suggest one of the Doctor's friends will die while fighting alongside the Time Lord.

Billie Piper, who plays Rose Piper, and Catherine Tate, who stars as Donna Noble, are the favourites to face the chop.

Torchwood's Captain Jack, played by John Barrowman, and Sarah Jane Smith (Elizabeth Sladen), his original companion for the 1970s, are unlikely to die as they are both filming new episodes for their own spin-offs.