Parts: 2 (3-minute)
Writer: Steven Moffat
Airdate: 18 March 2011
Production Code: n/a

Doctor: eleventh
Companions: Amy, Rory

Story: While helping the Doctor carry out some routine TARDIS repairs, Rory accidentally damages one of the thermal couplings, which causes the TARDIS to initiate an emergency materialization. To the horror of the TARDIS crew, the ship actually materializes inside itself, trapping them all in an unbreakable space loop...