- Dr. Zachary Smith: [about the alien space ship] Is it very complicated, my encyclopedic friend?
- The Robot: Very compact.
- Dr. Zachary Smith: Tell me more.
- The Robot: It's design is simplicity itself.
- Dr. Zachary Smith: Getting better all the time. How simple?
- The Robot: What do you want from me, blood?
- Dr. Zachary Smith: [speaking of the alien spaceship] Well, it's of no earthly use to me.
- Maureen Robinson: Well, why does everything have to have an "earthly" use, doctor?
- Maj. Don West: Don't let him answer that or we'll be standing here hours listening to the miseries of a galactic castaway.
- Dr. Zachary Smith: Major, you irk me.
- Prof. John Robinson: Will? Your mother asked you a question.
- Will Robinson: Not really, Dad. She was just expressing her momentary emotional anxiety in rhetorical terms. Certainly the state of my physical well-being should be apparent to all.
- Will Robinson: I wasn't aware that anything had happened to me, and if you insist on asking these primitive and emotional questions, I won't be able to tell you anything.
- Will Robinson: [at the chess board] Don't trouble yourself, Dr. Smith. We're not evenly matched.
- Dr. Zachary Smith: Perhaps not, but we COULD have a little chat.
- Will Robinson: About what?
- Dr. Zachary Smith: Oh, ships and shoes and sealing wax.
- Will Robinson: In other words, multidimensional excursion vehicles.
- Dr. Zachary Smith: How would you like to give me a few pointers on the technique involved in piloting that vehicle?
- Will Robinson: For what ulterior motives, Dr. Smith?
- Dr. Zachary Smith: [affronted] Ulterior motives? I?
- Will Robinson: All right, then I'll explain them to you: One, you can hardly wait to leave. Two, you're hoping that if you can learn to fly that vehicle, it'll make you some sort of Lord of the Galaxies. Three, if you can ever guide it back to Earth, you'll become... President of the United States at the very least.
- Dr. Zachary Smith: Really. I hadn't thought of that, but it does sound intriguing. Go on.
- Will Robinson: I'm sorry, Dr. Smith, but you and I don't communicate on the same level of maturity.
- The Robot: A product of contemporary technology is incapable of obsolescence.
- Will Robinson: Have YOU got a lot to learn.
- Dr. Zachary Smith: I've made a very important decision, Will.
- Will Robinson: Oh? Who do you plan to get in trouble THIS time?
- Dr. Zachary Smith: Oh, ye of little faith.
- Dr. Zachary Smith: You're not very kind, are you? All I want is to see you happy, to give you the companionship and the understanding that you deserve. Isn't that what you need?
- Will Robinson: It might be nice to have someone I wouldn't have to talk down to, but there's just one problem.
- Dr. Zachary Smith: What problem?
- Will Robinson: You're not doing this for me.
- Dr. Zachary Smith: Oh, my dear misguided boy!
- Will Robinson: We might get on a whole lot better if you'd admit you're doing this for yourself, Dr. Smith.
- Dr. Zachary Smith: You have cut me to the quick. What can I say?
- Will Robinson: It doesn't matter, 'cause I'd see through it no matter WHAT you said.
- Will Robinson: It's not much fun when you have to explain things to your own father, and everyone else besides.