Simply a nice, short look into the Second Doctor's mind a few hours after his very first regeneration.
The adventure with the Daleks is called 'The power of the Daleks', and is one of my favorites. Sadly, it's one of the early episodes that the BBC erased, so i've just listened to the audio.
This story is dedicated to the memory of Patrick Troughton, the actor who played the Second Doctor. May he rest in peace.