Jonny Quest: Season 1, Episode 20

The Invisible Monster (29 Jan. 1965)

TV Episode  |  TV-Y7  |   |  Animation, Action, Adventure
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Ratings: 8.5/10 from 57 users  
Reviews: 2 user

A fellow scientist accidentally creates living energy that only lives to feed on more energy, including that from living organisms. The Quest party answers his plea for help.


(as William D. Hamilton)
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Title: The Invisible Monster (29 Jan 1965)

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Episode cast overview:
Mike Road ...
Jonny Quest (voice) (as Tim Matthieson)
Don Messick ...
Danny Bravo ...
Hadji (voice)
John Stephenson ...
Dr. Isaiah Norman (voice)


A scientist working on a new energy source creates more than he bargained for. Dr. Quest receives a radio request for help from the man, but it is cut off, and from the sound violently. Now Benton, Race, Jonny, Hadji and Bandit must investigate and defeat an invisible entity that seemingly feeds on everything in its path! Written by J Dutton

Plot Summary | Add Synopsis





Release Date:

29 January 1965 (USA)  »

Company Credits

Show detailed on  »

Technical Specs

Sound Mix:


Aspect Ratio:

1.33 : 1
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Did You Know?


Originally, the series began with John Stephenson as the voice of Dr. Quest till it was felt his was too much like that of Mike Road's for Race. This is the only Jonny Quest episode to feature John Stephenson's voice after he discontinued playing Dr. Quest. See more »


The rifle Race carries on the first expedition to track the monster is missing when Race calls out hello in the second village. See more »


Dr. Benton C. Quest: Dr. Norman was experimenting with energy and mass. To make it brief, it got away from him. He found he had made a mass of energy that somehow came alive. It feeds on more energy, and it lives only to feed. I'm afraid it consumed Dr. Norman before he could stop it.
Jonny Quest: It eats people?
Dr. Benton C. Quest: No, Jonny. It consumes them. It eats energy - sunlight, electricity, the energy in a living body - anything it can get.
See more »

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User Reviews

Scared the pants off me as a child
28 February 2010 | by (Tennessee) – See all my reviews

Dr. Isaiah Norman, an old friend and colleague of Dr. Quest, calls with a frantic request for help. His latest experiment involving molecular energy has gotten out of control with devastating results. Somehow, Dr. Norman has created an invisible creature made of pure energy. It exists solely to consume more energy. The Quest Team quickly boards their plane to head off on another adventure. But will they get there in time to save Dr. Norman?

Finally, my run of bad luck with Jonny Quest is over. The Invisible Monster is one of those episodes that stands out. And why not? An effective monster, cool jet packs, and characters that actually die – it's got all the makings of a first rate Jonny Quest episode. It was the kind of episode that 40 years ago would have had my lights on all night. It was that scary! Watching today, I may have slept comfortably, but I can still recognize class when I see it. It's truly one of the most memorable of all of the Jonny Quest episodes. One thing I noticed looking at it today, the monster doesn't have the same polished appearance of the other artwork from Jonny Quest. It's a simple design with colors that change from frame to frame. But I guess with a creature made of molecular energy, you could do almost anything with it and it would look okay. And that solitary eye – creepy! And that noise – even creepier. I love it! The Invisible Monster easily gets an 8/10 from me.

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