Originally broadcast on BBC One in Spring 1968, the original episodes were wiped in late 1974. The animations are based on off-air audio recordings made by fans at the time of the 1968 broadcast.
Possible Easter Egg: The episodes are peppered with Wanted Posters featuring a picture of Roger Delgado's portrayal of the Master.
Features the first appearance of the Doctor's sonic screwdriver, which would be a fixture of the Third and Fourth Doctor era before becoming a mainstay in Doctor Who (2005).