C'mon... someone has to recognize the dude with the Tommy gun...
Why not give us a clue? It's not easy finding his first appearance, would be even harder if we don't know what he originally dressed in.
Tommy Lee Jones?
Tommy: The Musical?
Tommy Tank Engine? (Ok, it's really Thomas, but work with me here.)
Tommy, the bully that beat me up in fourth grade?
He is/was part of the Yorick Gang...
He was supposed to be on one of the away teams to Spielbergian film sets...
He didn't show up and Gielgud wondered about that...
...he's the one who wears sunglasses...
...there's a "characters" button at the top that actually includes him...
When did he first appear? With characters like him, it's sometimes really hard to nail down where they're from, especially if their supposed appearance isn't in-comic.
The character bios call him Christopher Plummer, a cybernetic bodybuilder. I'm not sure we've actually met one of those types in this strip, although I could've sworn you used that head he's using somewhere in this strip before, I just can't find it.
First appearance when K.B. was rescued from prison's gates: http://yolt.thecomicseries.com/comics/61
Exposition talking about him: http://yolt.thecomicseries.com/comics/69
Plummer on stage in "Macbeth" (he's later a witch, Macduff... very visible roles): http://yolt.thecomicseries.com/comics/pl/34516
Anyhow - he's not had as many words as K.B. or Shatner, but he's been there for most of the run of the comic.
Even more confusion there, perhaps you should set up some of his alternate faces in his character bio so he can be tracked properly.
Well, I assume they're alternate faces, anyway, but I could be wrong. ;)
I suppose I should have provided each actor with pics for all of their roles. With multicasting for "Macbeth," though, each would have ended up with a lot of pictures.
Plummer's had one unifying facial feature throughout - sunglasses. Even as King Duncan, he's still rockin' out the Snake Oiler specks from the "Speed Racer" line. I'll admit that he's not had as much face-time as K.B. or Shatner or even Gielgud... but it would have been weirder if the traitor had been one of the more notable ones, no?
Anyhow, he's on fire. His look will change as a result, but I'll try and make things clearer - and a return to the essentials.