As Dr. Quest works on an revolutionary new weapon, Dr. Zin sends an advanced and unstoppable spider-like robot to examine it.


(as William D. Hamilton)

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Episode cast overview:
Roger T. 'Race' Bannon / Radar Man (voice)
Jonny Quest (voice) (as Tim Matthieson)
Don Messick ...
Dr. Benton C. Quest / Bandit / Pilot Red 1 / Jones (voice)
Danny Bravo ...
Hadji (voice)
Vic Perrin ...
Dr. Zin (voice)
Doug Young ...
Officer / Gate Guard / Zin's Servant / Soldier Guarding Robot Spy / Sergeant (voice)


On a military base, Dr. Quest is working on a secret revolutionary new weapon, the Para-Power Ray Gun, a weapon that drains the power from any mechanical device and renders it useless. Dr. Zin, very much interested in this project, sends a strange looking craft with a mysterious black sphere inside to land near the base. When the puzzled Quests have the sphere brought to the base for later examination, Dr. Zin soon engages the machine as a large spying robot sent to examine the secrets of Dr. Quest's weapon. Although Dr. Quest and Race catch it in the act, Dr. Zin brags that they cannot stop it from escaping. In the ensuing battle, the Quest family learns that their enemy is not bluffing when the departing machine literally shrugs off the most powerful blows against it. Can the Quests find a way to bring the robot down in time? Written by Kenneth Chisholm (

Plot Summary | Add Synopsis





Release Date:

6 November 1964 (USA)  »

Company Credits

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Technical Specs


Sound Mix:


Aspect Ratio:

1.33 : 1
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Did You Know?


Star Trek fans have noted that the opening sequence of this episode is very similar to that of a first season Star Trek episode entitled "Tomorrow Is Yesterday". See more »


When Dr. Quest says "And the door's open," it's Race's lips that move. See more »


Soldier Guarding Robot Spy: All right, who's in there? I'm sure I heard something. What the... An eye! Ahhhhhhhhhh!
See more »

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User Reviews

One of the best
11 December 2008 | by (Tennessee) – See all my reviews

Desiring to learn the secrets of Dr. Quest's latest invention, the para-power ray gun, Dr. Zin sends a robot spy to check it out. Dr. Zin's unmanned ship lands near the Quest compound. Upon investigation, Dr. Quest and Race find a mysterious orb. They place it in a storage building for latter examination and go about their usual nightly routine. But, as they will soon discover, the mysterious orb is far from routine.

Even if you are only familiar with Jonny Quest on the most casual of levels, I'm confident that The Robot Spy would likely be the episode that most people would recognize. The image of the giant, indestructible, spider-legged mechanical creature is an iconic memory for many of us who grew up in the 60s. It's even prominently featured in the opening credits. Beyond the images, The Robot Spy's status as one of the best Jonny Quest episodes is well deserved. There's plenty of action, mystery, and suspense - what more could you ask for? The first time the robot hits a guard with one of the tentacles - wow! How cool was that? I enjoyed this episode as a child and still find it entertaining. I'm not sure at this point whether it's my favorite episode or not, I'll have to get through the other 18 or so episodes to make that call. But I have no doubt that it will end up in my top five.

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