Nitpick: In this episode, Caroline calls John "Buck Rogers" because of his trip to space. However, John's experiences more resemble that of Flash Gordon. Buck Rogers went back to Earth, but in the 25th century, while Flash Gordon went to another galaxy inhabited by many different species of aliens.
Nitpick: It seems unusual that Sikozu gets a purple bruise on her forehead due to her bumpy ride through the wormhole. Humans bruises are purple due to the fact that tiny blood vessels under the skin burst, and the coagulated red blood looks purple through the layers of skin. However, Sikozu's "blood" is white, making it seem strange that her bruising appears so similar to that of a human.
There are birds of paradise flowers in the mansion where Crichton and the crew are staying. Noranti eats one, while Sikozu watches with wide eyes. The Earth's birds of paradise flowers strongly resemble Scarran Crystherium Utilia, and will be of great importance in later episodes.
Crichton has finally gotten home to Earth in his proper time, completing one of his main goals throughout the series.
Americans, and subsequently the whole world, now have access to information about alien species and alien technology.
Aeryn has discovered that Crichton is using the laka, and doesn't seem too happy.
Caroline was previously seen in "Unrealized Reality" as Crichton's girlfriend. Laura was also seen in that episode, talking about past work with Crichton and him once trying it on with her.
Braca is still unaware of Grayza's full plans, and had no idea of her deploying the Skreeth. As such, Scorpius was also left in the lurch.
Aeryn: (after D'Argo kills the Skreeth) Well. Merry frelling Christmas. Crichton: Amen.
Chiana: (drunkenly flirting with a dignitary) So, are you as bored as I am? Holt: I'm sorry, senator, she's still learning our customs. Chiana: Spank you very much! (leering) Maybe you could teach me.
Jack: I've always supported you as much as I could, son. You're not looking at the bigger picture here. Crichton: You don't see the big picture. You can't conceive it. Earth has to work together on this. Jack: Yeah? Well, you're asking the impossible on that one. Crichton: Impossible. 'Impossible is not in our vocabulary.' Who said that? You. You did. Four days before you set foot on the moon. You taught me to believe that. That belief kept me alive. Please tell me you still believe in it. Jack: I'm not sure what I believe anymore.
Crichton: And everyone is telling me... how different I am. They're right. But they don't have a clue why. They can't know what I've seen... what I've done... what's been done to me. They can't know what's out there waiting for them and I can't tell them, because they wouldn't believe me. Hell, if I tried they'd lock me up. Frell. I'd lock me up.
Crichton: Space travel was your dream to unite mankind. When did that change? Jack: September the 11th. This isn't the same world you left four years ago, son.
Holt: Congratulations! You have accomplished something truly momentous. Earth's first contact with extraterrestrial life. Crichton: (laughs) Well, T.R., it's your lucky day. (calls over his shoulder) D'Argo! Aeryn! (back to Holt) Just don't make any sudden moves.
Noranti: Rygel, have you tried this? Rygel: Oh, another delicacy! What's it called? Noranti: It's called... cop-porn.
Jack: (holding up Christmas ornament) Remember this, John? You made this when you were five years old. Your mother loved it. Crichton: So what's next? We break out the bare-assed baby pictures? Jack: Hey, that's not a bad idea! Olivia: Yeah, let's take a vote. Aeryn? Aeryn: Of course!
Jack: I don't want to lose you, son. I can't shake this feeling that you're not coming back. Crichton: I'll be back. That's a promise. You take care of my home.
Sikozu: (on telephone) Biologic examination? I said no, and I don't care how many of the others have consented. You can go stick your probes in one of them. I'm not interested. Chiana: Well, you never know. You might like it. Sikozu: (still on phone) No, I will not have an x-ray. I don't care how much it advances mankind's xenobiological knowledge. N... Leave! (throws the phone into the garden) Rygel: Eat something. You'll feel better!
Jack: This isn't the same world you left four years ago, son. It's about survival now.
Sikozu: Chiana, you know the humans won't let us out unescorted. And the way you make friends, who can blame them?
Lani Tupu, who was credited with voicing Pilot, did not play any part in this episode.
Aeryn's line "Merry Frelling Christmas" was ad libbed by Claudia Black.
Ben Browder names this as one of his favorite episodes the series, because it took the risk of actually taking Crichton back to Earth in real time.
The Grinch The Skreeth was colored green as a deliberate nod to the Dr. Seuss character The Grinch.
Caroline: (speaking to Crichton as he writes in a notebook) Hey, Buck Rogers. Caroline is referring to Crichton as the fictional astronaut, who like Crichton had many space adventures, most recently in the 1979 TV show Buck Rogers In The 25th Century.
Title: The Title, "Terra Firma," is Latin for "solid earth". The title indicates that Crichton has finally reached his true home on the real planet Earth, rather than an illusion of one such as the one created by the Ancient Jack in the first season episode "A Human Reaction".
S 4 : Ep 22
Aired 3/21/03 (46:00)
S 4 : Ep 21
Aired 3/14/03 (45:00)
S 4 : Ep 20
Aired 3/7/03 (46:00)
S 4 : Ep 21
Aired 2/28/03 (46:00)
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