More than 10 million TV viewers are expected to tune in to the season finale of Dr Who tomorrow amid speculation over whether David Tennant's timelord will be killed off.
Last week's gripping cliff-hanger saw the Scottish actor's character beginning to regenerate, which happens every time a new Doctor Who is introduced.
The plot line for the episode has remained such a closely guarded secret that the BBC has banned any preview tapes of the last show.
Blasted by fans as 'another marketing ploy' Tennant may very well regenerate into two doctors, both played by him or he may be leaving the series .
Stars being tipped to replace him are Robert Carlyle , Jason Statham , Old Knudsen , Alan Davies also Simon Pegg and Cold Feet star James Nesbitt. Pegg actually played a villain in a previous Dr Who episode.
Ten million fans are set to tune into Dr Who's finale on Saturday as long as their mother's allow them.