The Forms of Things Unknown - S1-E32
Trivia: This is the only Outer Limits episode that lacks both opening and closing narration. It was absent because "Forms" was the unsold pilot for a series called The Unknown. A second version, stripped of all its supernatural elements (Tone was simply a mad scientist, not a real time traveler), also failed to sell.
Trivia: This was the first US TV series ever to resolve its story line and air a definitive ending, despite network objections that doing so could harm its syndication revenue. The 2-hour finale, "The Judgment," garnered the highest TV ratings ever up to that time, a record it held for many years afterward.