Basically the title. They’re going to encounter animals they’ve never seen before, or notice a complete lack of familiar animals. They’re going to notice the none of the plants are the same, and that there aren’t any domesticated plants other than what they may be carrying. They might try to go back the way they came and find it impossible.
“Is this a two-parter?”
“No, we don’t do those.”
“What do we do with this B-plot guy that saw the ship? We’ve got a whole thing going on with his story that could go to some interesting places. How should we handle that?”
“Just kill him.”
“Should we re-write it and just take that part of the plot out?”
“Nah, just have him off himself or something.”