Have to say... Never even suspected who "Worm Face" turned out to be.
And why should you? It was a classic "let's pick someone at random to be the real mole." I guess we coulda narrowed it down. We knew it wasn't going to be a main character, so who did that leave?
Of course, they way they took care of the Hal arc, we all were lead to believe he was the mole.
Which didn't make any sense since Hal was part of the real mission that required the fake diversion plan that the mole reported back to the aliens.