At last, you witness strike three of the Harry Sullivan slur. Harry has been known to be quite a klutz, regardless of his optimistic attitude. After hes caused a huge rockslide over the Doctor, nearly crushing him to death, he then attempts to unbuckle the harness placed by the Cybermen on the Doctor. Unfortunately, he doesnt realise what seemed only natural to do in the situation wouldve caused the bomb the Doctor was wearing to detonate and... well, obviously kill him. The Doctor wakes up, though, and upon asking him a series of questions followed by hysterical laughing, shouts Harry Sullivan is an imbecile! at the top of his lungs - only to pass out once again. There is no doubt that Harrys got troubles but if youre ever in the middle of such a fabulous disaster, needless to say, you know how to make all systems go.