Jonny Quest (1964–1965)
2 user

The Invisible Monster 

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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Episode cast overview:
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

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Release Date:

29 January 1965 (USA)  »

Company Credits

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Technical Specs

Sound Mix:


Aspect Ratio:

1.33 : 1
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Did You Know?


A polling at Classic Jonny ranked this episode #1 among fan favorites. 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 »


Roger T. 'Race' Bannon: We seem to be on the trail of a two-legged tornado.
See more »

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User Reviews

Energy beast running amok in the jungle
1 June 2007 | by (United States) – See all my reviews

In this episode, which I remember watching and being scared senseless as a small child, one of Benton Quest's colleagues accidentally creates an invisible energy beast (ala Frankenstein) that is attracted to any kind of electrical energy. This of course leads to the destruction of the man who created it, but not before he contacts Dr. Quest. The Quest team rushes down to see the destruction, and end up using jet packs to buzz bomb the energy beast who they track as he plows through the jungle. The paint bombs allow them see the shape of the monster, that it has one eye, and screams whenever it sees something it doesn't like.

Ultimately they trap the beast in a cave by having it follow electric lights. Once in the cave, they spring a trap that discombobulates the monster back into the particles from whence it sprang. This was the first episode I ever saw, and it had me hooked. I still compare nearly all cartoon I watch to the quality of the story lines and the animation that was employed by the Hanna Barbera production team.

Occasionally they show Jonny Quest on Boomerang, Hanna-Barbera's TV channel. I also understand that there is a DVD with the first season on it, but it seems to be missing some of the best episodes. I keep waiting for a live version movie of Jonny Quest to come out (are you listening Mr. Spielberg?). You just know that there would be a million cartoon junkies like me who would line up to see it.

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