From witnessing the genesis of the Daleks to preventing the death of the universe at Logopolis, the Fourth Doctor was an adventurer on an epic scale. Armed with a gleeful smile, swashbuckling charm and righteous morality, he defeated Sontarans, ancient vampires and the Black Guardian.
It was this incarnation of the Doctor that found and reassembled the Key to Time, that tried to reason with Davros at the birth of the Daleks, and was invested as Lord President of the High Council of Time Lords. Always selfless, his fourth body died saving the universe from the Master. But that moment had been prepared for...
You're a classic example of the inverse ratio between the size of the mouth and the size of the brain.
Killing me isn't going to help you. It isn't going to do me much good either.
All right! I confess, I confess. I confess to your being a bigger idiot than I thought.
There's no point being grown-up if you can't be childish sometimes.
You may be a doctor. But I'm THE Doctor. The definite article, you might say.