Doctor Who episode 307: Day of the Daleks – Episode Four (22/1/1972)
So, after spending three episodes building up to a showdown between the Doctor and the Daleks… It doesn’t happen. He spends the episode retreating from them, luring them into a trap and watching them get blown up by the same bomb that was meant to ensure their future. It’s poetic justice. It’s a logical resolution to the time paradox. It’s also a bit of an anti-climax. Last time the Doctor confronted the Daleks he went up against their Emperor. This time, he doesn’t even get to berate a subordinate.