A scientist experimenting with speeding up human evolution, hires on uneducated, but bright Gwyllim, from the nearby Welsh mining town. He proves a devoted lab assistant, but not content to... See full summary »



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Episode complete credited cast:
Gwyllim Griffiths
Cathy Evans
Professor Mathers
Nora Marlowe ...
Mrs. Ives
Robert Doyle ...
Wilt Morgan
Constance Cavendish ...
Gert 'the Bread' Evans
George Pelling ...


A scientist experimenting with speeding up human evolution, hires on uneducated, but bright Gwyllim, from the nearby Welsh mining town. He proves a devoted lab assistant, but not content to stick to animal subjects, Gwyllim speeds up his own evolution, becoming a super genius with 6 fingers and a huge cranium. With such mental powers does the rebellious, former coal miner acquire equivalent wisdom and maturity too ? Written by David Stevens

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Release Date:

14 October 1963 (USA)  »

Company Credits

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Technical Specs


Sound Mix:

Aspect Ratio:

1.33 : 1
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Did You Know?


At the end when he was in the machine it was originally intended for Cathy to regress Gwyllim beyond a caveman so that he would look like an ape. The network objected, fearing that such a scene would offend a number of viewers, so they stopped the regression at the point of a caveman. See more »


When the doctor (Edward Mulhare) is thrown back down the hallway by a glance from Griffiths (David McCallum), you can see the cable connection on the back of the stunt man as he rolls over at the end of the stunt and before the scene is cut. See more »


Control Voice: [Closing Narration] An experiment too soon, too swift, and yet, may we not still hope to discover a method by which within one generation the whole human race could be rendered intelligent, beyond hatred, or revenge, or the desire for power? Is that not, after all, the ultimate goal of evolution?
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Referenced in Lucy (2014) See more »


The Well-Tempered Klavier
Written by Johann Sebastian Bach
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User Reviews

Superb Episode and Series
14 June 2010 | by (United States) – See all my reviews

I saw this episode when I was 9 years old and was glued to my TV. David McCalum's makeup was designed by John Chambers who later did the ears for Mr. Spock. This series had the best special effects people in the business, designing the most grotesque looking monsters you will ever see. Unlike the Twilight Zone which played their monsters for laughs, the teaser of The Outer Limits each week gave you a taste of what to expect in the next hour and you did not have to wait until the very end to see them. 1st Season Director of Photography, Conrad Hall and his camera man William Fraker shot episodes with fish eyed lenses and weird camera angles coupled with high contrast lighting producing black and white quality equivalent to feature films. Monsters like the Chromoite from THE MICE looked like a quivering Jelly Fish with claws for hands and a slit for a mouth where it ate its own goo from the lake and male and female Aliens from FUN & GAMES who used boomerangs as weapons to kill their opponents is an example of the monsters on The Outer Limits. Twilight Zone had nothing like this.

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