Season finale. According to Southern Star, a fifth season was never under consideration due to the tax incentive ending after 65 episodes. Rush finishes on 70 episodes.

Ratings: 0.656 million viewers (16th for the night).

Guest star Adam Pierzchalski is a member of Melbourne band Vulgargrad with season two guest star Jacek Koman, who is married to Catherine McClements.

Had there been a fifth season, only the four remaining original actors would have returned - Rodger Corser, Nicole da Silva, Catherine McClements and Samuel Johnson.

Josh: (over the phone) It's done, Lawson. We're done.

Leon: I think I might need to start taking my iodine pills.
Kerry: You haven't been taking them?
Leon: It's kind of like I've accepted defeat.
Kerry: Leon, if that thing blows, the only thing between you and a short life without a thyroid is those little pills!
Leon: It's the metallic taste. I can't stand the taste.
Kerry: Are you serious?!
Leon: Yeah, it's a complete phobia. I just... I can't... It's why I eat with my hands. I can't even put a fork in my mouth.
Kerry: I have seen you eat with cutlery.
Leon: Plastic.
Kerry: You don't have to take them orally. (pauses) In the meantime, this Church of the Shining Cloud, Kenta Tomi, the whole doomsday cult shit, I want everything on them. I don't care how trivial. The lot.
Leon: What do you mean I don't have to take them orally? (Kerry gives him a look) That's... that's... that's wrong... that's... (shakes his head)

Charlie: (to Anna Vargas) You must be important.

Charlie: If you guys wanna go, say so now.
Stella: I'm okay. (about Josh) And he's lost the will to live anyway.
Josh: Piss off.

Charlie: (over the radio) The minister is adamant she's staying.
Leon: Well... what's one less politician?

Christian: (about Josh and Lawson) Those two should just have sex and be done with it.
Shannon: Is that what guys do, is it?
Christian: Ooh. Not this one.

(Leon is drinking a can of V)
Kerry: I thought you had an oral metal phobia.
Leon: It's all lips, no tongue, Kerry.

(Anna Vargas has a bullet proof vest on)
Stella: Thank God the turtle look is in this season.
Josh: Maybe Charlie's got a sense of humour.