Part One
Series Episode Number: 510World Premiere: Sat 29 Sep 1979 - 6:06pm BST [BBC One] (United Kingdom)
First Broadcast: Sun 18 Oct 1981 - 11:00pm CDT [WTTW 11 Chicago]
Running Time: 25 minutes
12.40 Million (UK)
Chart Position: 50 () (UK)
Recorded on Mon 21 May 1979 in Television Centre 3
While on holiday in Paris, the Doctor and Romana experience a time distortion. At the Louvre, someone is taking an unusual amount of interest in the Mona Lisa.