Jonathan Harris credited as playing...
Dr. Zachary Smith
- Will Robinson: If you can help dad, I'm all for it.
- Dr. Zachary Smith: Very well, I shall undertake to start working on my patient at the earliest opportunity.
- The Robot: May I speak?
- Dr. Zachary Smith: You have my permission.
- The Robot: In my opinion, it is not Professor Robinson who needs psychiatric treatment. It is his doctor.
- Dr. Zachary Smith: Just you wait, you deplorable dummy.
- Dr. Zachary Smith: Let me handle the professor. Possibly you're unaware that I'm completely familiar with the latest techniques in the field of psychiatry.
- Maj. Don West: As a doctor or a patient?
- Dr. Zachary Smith: Spare me your insulting barbs, Major, or I shall withdraw my offer of help.