Star Trek: Voyager (1995)

S2E23 The Thaw

Title: The Thaw Plot: Stardate: Unknown. The Voyager crew stumbles upon a planet plunged into a sudden ice age. Upon investigation, they uncover a set of stasis pods housing a small group of individuals who are linked to a malfunctioning virtual reality system. As the crew delves deeper, they realize that this artificial environment has spiraled out of control, trapping the occupants in a nightmarish existence.