Modern Espionage
I recently re-watched Modern Espionage, and it's still one of the highlights of season six for me. Lots of good fun, I love that they brought paintball back, and the whole thing is just a delight.
I have a quibble, though. Given the espionage angle, I really thought that SilverBallz should've been Jerry the Janitor. He was friendly and likeable the whole show. Having him betray them would have been a bit of a shock, and would have hearkened back to stuff like Mission: Impossible (the first one).