30 December 1980: wedding of Tom Baker and Lalla Ward
ii) broadcast anniversaries
30 December 1967: broadcast of second episode of The Enemy of the World. Giles Kent asks the Doctor to help him against Salamander. Jamie and Victoria manage to infiltrate Salamander's headquarters.
30 December 1972: broadcast of first episode of The Three Doctors, starting Season 10 and bringing back Patrick Troughton and William Hartnell. The Time Lords are losing energy; UNIT is besieged by strange special effects and the First and Second Doctors return.
30 December 1978: broadcast of second episode of The Power of Kroll. Kroll starts grabbing people with his tentacles.