Season's greetings: Not getting to Earth too often, Farscape's taken the opportunity to�follow one seasonal favourite, Halloween, with another, Christmas.� Sadly,�no�broadcaster was able to schedule this episode to go out�exactly when it's set, just before Christmas.

Classical title: Terra Firma is Latin for solid ground or earth.

Feline friends: John had a cat named Mr Jingles as a boy, which got stuck�up the chimney one Christmas.� Shown a picture of John's pet, Aeryn�asks if it could talk.

Keeping the doctor away: They may be good for you, but Sikozu really doesn't like apples.� She's not keen on being probed either, leading her to some really dreadful mobile phone behaviour.

Babel-icious: In a nod to the events of season one's A Human Reaction, a few Earth bigwigs agree to have translator microbes injected into them, allowing them to understand all languages.� Think what a boon that would be at the Eurovision Song Contest.

Junk food junkies: Rygel and Noranti don't care where they are - so long as the food keeps coming.� One Earth delicacy they're particularly taken with is popcorn - so much so that they take some back to Moya.

Servicing the higher ranks: Naughty old Grayza tricks Braca into thinking he's had a passionate tryst with her - the minx!�

Speaking about his working relatinship with Grayza actress Rebecca Riggs, David Franklin (Braca) told Farscape Magazine of a little misunderstanding the two had.�

"Rebecca turned to me, adjusted her outfit, and said, 'Are they even?'� She was referring to her breasts.� But I misheard her and I thought she said, 'Are they evil?'� Well you don't want to drop the ball in that sort of situation, so I said, 'Well, yes, they're malevolent!'� She looked at me in amazement!"

Old flame: It seems that John and Caroline's relationship wasn't as serious as all that - just "good casual times" according to her.� Good news for Aeryn, perhaps?

Bug-eyed monster: The Skreeth monster that Grayza sends after John shares traits with the Predator, from the�1987 film of the same�name.� It was similarly able to become invisible.� The look of the creature is reminiscent of another famous film creation - HR Giger's Alien, from the 1979 Ridley Scott masterpiece.

Serious stuff: Real political events on Earth affect John in this episode - his father's feeling that the alien technology shouldn't be shared with all countries of Earth has a lot to do with the blow suffered by the US from the September 11th terrorist disaster.

The John Crichton guide to pop culture.

I, E.T. "Don't worry.� Be happy" says John to his sister Olivia. He's imitating E.T.�from the 1982 Spielberg film.� Perhaps it's a comment on�how he feels back on Earth.