Cornell physics professor Dr. Mukund Vengalattore joins us to talk about Dr. Who's Weeping Angels and the strange overlap of quantum reality and science fiction. Dr. Vengalattore explains to Faith and Heather that, on the quantum level time actually runs forward and backwards, and for a rare instance the scientific world becomes "very wibbly-wobbly timey-whimey".

The search for the Key to Time lands Dr. Who and Romana on a moon inhabited by swamp people---and a gigantic monster. Dr. Who: Tom Baker. Fenner: Philip Madoc. Romana: Mary Tamm. Thawn: Neil McCarthy. Dugeen: John Leeson. Rohm-Dutt: Glyn Owen.

The White Guardian gives the Doctor a quest to find the six disguised segments of the Key to Time which, when assembled, will be used to restore the balance of the cosmos. To aid him he is given a new companion, a female Time Lord called Romana, and a tracer device.

The TARDIS doors open before it has materialised causing it, and everyone inside, to shrink. Landing in an English garden, the travellers discover that they are only an inch tall.

The Doctor and Romana uncover a drug-smuggling operation and set out to find the source of Zip, the most dangerous drug in the universe. Lalla Ward. Rigg: David Daker. Della: Jennifer Lonsdale. Tryst: Lewis Fiander.

Captured by The Master, Dr. Who attempts a desperate escape in the third chapter of "The Sea Devils." The Master: Roger Delgado. Dr. Who: Jon Pertwee.

"The Sea Devils" take over the prison and form an alliance with The Master (Roger Delgado). Jon Pertwee, Katy Manning.

The TARDIS lands on a seemingly tranquil planet that a team of scientists hopes to colonize. Peter Davison, Janet Fielding. Sanders: Richard Todd. Hindle: Simon Rouse. Panna: Mary Morris.

In Wales, items include a "Dr. Who" script and pottery.