The signamancy in these calls continues to be interesting. Can't place two of the forms Charlie takes, though:
1 - Palpatine (Starwars)
2 - Victor Von Doom (Fantastic Four)
3 - ? (Connery's character from Highlander?)
4 - The Agent (Matrix)
5 - ? (No clue)
6 - Kahn (Star Trek: Wrath of Kahn)
7 - Betelgeuse (Beetlejuice)
8 - Jack (Erfworld) Heheh.
9 - Joker (Batman)
I like how they have generally have something in common with the forms next to them. It feels like a progression, not just complete randomness.
Also, it's interesting how Tremennis and Slately shift form during the meeting, but Parson did not. Was that another sign of his alien nature, or just because that aspect of the call hadn't been thought of at the time?
Edit: Oh, also: Last panel? Gorgeous.