Fridge / Doctor Who S2 E8 "The Chase"

• The Doctor watches Ian and Barbara's return on the Time-Space Visualiser. Given that they were two years off target, the Doctor must have gone through a lot of trial and error on the Visualiser before he finally located them.
• A lot of people have theorised over the years that this is the earliest serial that could be considered part of the Last Great Time War, and this Dalek squad is attempting to take out the Doctor as early in his own life as possible. We may be watching the inverse of "Genesis of the Daleks"!