Jonathan Harris credited as playing...
Dr. Zachary Smith • Daddy Zach • Zeno
- [repeated line]
- Don West (Mark Goddard): ...Well, look on the bright side: Things can't possibly get any worse than they are right now.
- [at that moment, Smith shows up]
- Dr. Smith: [pompous] ... Never fear, Smith is here!
- Don West (Mark Goddard): [through gritted teeth] I had to open my big mouth.
- various J2 crew-members: [REPEATED LINE: Smith is asleep when the others come looking for him] ... Dr. Smith!
- Dr. Smith: [wakes up with a start] I'm innocent!
- [repeated line]
- Robot: ...Dr. Smith. If you are calculating what I calculate you are calculating, I must advise you to recalculate. You might have another calculation coming!
- Dr. Smith: Dispense with the calculations, you nickel-plated know-it-all; for once, give me a *simple* and *straightforward* response!
- Dr. Smith: [repeated lines, on those rare occasions when Smith has saved the day] ... You owe me for this, Professor.
- Professor John Robinson (Guy Williams): ...I suppose you're right. Just don't get used to it, Smith.