Star Trek: Voyager: Season 5, Episode 21

5 - 21: Juggernaut

Voyager encounters a damaged and adrift Malon freighter in danger of releasing deadly theta radiation into that sector of space and rescues two crew members. Captain Janeway sends a repair crew to try and contain the radiation spread. Before they embark on the mission, the two crewmen warn them about the "Angel of Decay" that wreaks havoc aboard the ship.