Twilight Zone 1985 - SE01 EP37 A Small Talent For

An emissary (John Glover) from an alien race arrives to claim to have genetically engineered Humanity. He directly challenges the United Nations to prove Humanity’s worth, displeased over their “small talent for war“. He then tells them that Mankind has failed to produce the potential that the aliens nurtured in them thousands of years ago, and as a result, all life on Earth will be destroyed in 24 hours. With the survival of Humanity at stake, the UN hurriedly establishes an accord for lasting global peace and presents it to the emissary.