Voyage to the Bottom of the Sea (1964)

S03E21 Shadowman

Title: Shadowman Plot: The Seaview operates with a minimal crew as it assists in launching a groundbreaking interstellar probe. Meanwhile, Chip Morton becomes possessed by a mysterious alien entity known as the Shadowman, whose mission is to sabotage the probe's journey. As tensions rise, the crew must confront this hidden threat while navigating the challenges of deep space.