The BBC have revealed the official synopsis for episode ten of Doctor Who Series 7, titled Journey to the Centre of the TARDIS, and you can read it below:
A spaceship salvage team drags the TARDIS on board, sending its systems into meltdown.
As the Doctor marshals the motley salvage crew outside, he realizes Clara is still trapped within his malfunctioning ship, pursued by a dangerous group of ossified monsters. He has just 30 minutes to find Clara and save his TARDIS before it self-destructs.
Journey to the Centre of the TARDIS is penned by Steve Thompson airs on Saturday 27th April, with the time to be confirmed.