Doctor Who: 8 Reasons The Tenth Doctor Was An Actual Monster

We knew that the Tenth Doctor refused to die. He had already wasted a regeneration to keep the same face during the season four finale and set in motion a chain of events that will be covered later on. When a prophecy claimed that "He will knock four times," we all expected that it would tie into the Master's return from the dead.

Sure enough, the four knocks kept coming, but the Doctor survived his showdown with the Master and the Time Lords. He thought he had been spared... then Wilf knocked on a glass window four times and fulfilled the prophecy.

Wilf had been trapped inside a case that was going to fill with radiation and kill him, so the Doctor, assuming he had escaped his death, is brought to the realisation that he has to die to save Wilf. He makes a huge fuss about how dangerous the machine is, and Wilf tells the Doctor to leave him. Ten replies: "Okay, right then, I will because you just HAD to go in there, didn't you?"

The following conversation is genuinely harrowing as Wilf is willing to sacrifice himself. Meanwhile, Ten has a tantrum and says some really nasty, hurtful things: "You're not remotely important, but me? I could do so much more!"