7X10 Journey To The Centre Of The TARDIS(Grading/Discussion)(SPOILERS)
"A spaceship salvage team drags the TARDIS on board, sending its systems into meltdown.
As the Doctor marshals the motley salvage crew outside, he realises 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"
Finally an episode devoted entirely to the TARDIS and it only took 8 years.
"Inception" is a layer cake.