No, he's not; I'm still only halfway through and he's in it at some point towards the end, so I haven't seen him yet, either. That was good thinking, though, because that's Barry Foster as the Kaiser, who is Colin Baker's father (his characters father, I mean, or at least, that was my assumption).

Because of the huge time span and things, very few people clock up more than 2 episodes, even the major characters.