Off the top of my (genre) head…

The Expanse: It Reaches Out (3x08)

The Expanse: Saeculum (4x09)

The Expanse: Gaugamela (5x04)

Star Trek: TOS: The Doomsday Machine (2x06)

Star Trek: TNG: Cause And Effect (5x18)

Star Trek: Voyager: The Void (7x15)

Farscape: Crackers Don't Matter (2x04)

Farscape: Dog With Two Bones (3x22)

Farscape: Unrealized Reality (4x11)

Doctor Who: Utopia (3x11)