The Outer Limits 1963 s1 e 5 The Sixith Finger

Working in a remote Welsh mining town, a rogue scientist, Professor Mathers, discovers a process that affects the speed of evolutionary mutation. Mathers suffers guilt for his role in developing a super-destructive atomic bomb, and hopes his new discovery will better the human race.

A disgruntled miner, Gwyllm Griffiths, volunteers for an experiment that will enable the professor to create a being with enhanced mental capabilities. As a man sent forward equal to 20,000 years of evolution, Gwyllm soon begins growing an overdeveloped cortex and a sixth finger on each hand. When the mutation process begins to operate independently of the professor's influence, Gwyllm takes control of the experiment.

Now equal to 1 million years of evolution, and equipped with superior intelligence and powers of mind, such as telekinesis, that are capable of great destruction, Gwyllm seeks vengeance on the mining town which he loathes. When he meets 2 motorcycle cops, he says, "Your ignorance makes me ill and angry ... your savageness ... must end!" However, before he acts on his thoughts, Gwyllm holds back, realizing he has by now "evolved beyond hatred or revenge, or even the desire for power," and instead longs for "when the mind will cast off the hamperings of the flesh and become all thought and no matter – a vortex of pure intelligence in space."

Gwyllm enlists the help of his girlfriend, Cathy Evans, to operate the machine to push his evolution even further forward. Instead, out of love for him, Cathy reverses the process at the last second, bringing Gwyllm back to his former self. But, the out-of-control reversal is too much for Gwyllm, and he slowly succumbs to the adverse effects while Cathy comforts him.