- Major Don West: John, I've had him up to here! I can't take anymore! Now either he goes or I do!
- Maureen Robinson: Oh, now, Don, surely you don't mean that.
- Dr. Zachary Smith: Dear friends, rather than place you on the horns of a tragic dilemma and in the interests of harmony, I am quite prepared to voluntarily remove myself from camp.
- [John, Maureen, Don, Judy, Penny, and Will all remain silent]
- Dr. Zachary Smith: Is no one going to stop me?
- Dr. John Robinson: Well, you did volunteer to leave, didn't you?
- Dr. Zachary Smith: Yes, I did. But a few more protestations on your part would not have been amiss.
- Sesmar: [using a device to determine what feelings Dr. Smith is capable of] Sly, lazy, cowardly, sycophantic. Extraordinary. There's nothing useful about you at all.