The Doctor: You can't rule the world in hiding. You've got to come out on the balcony sometimes and wave a tentacle or two.
At the climax of episode 2, the Doctor is about to catch Lupton when the latter simply teleports to safety. So why didn't he do that in first place - before engaging in a 15-minute chase.
The first thing the Third Doctor does on-screen is collapse out of the TARDIS, which is also the last thing he does in that incarnation.