Star Trek: Voyager Season 4 Episode 16

Stardate: 51652.3 – When Voyager encounters a disabled Hirogen ship with a wounded Hirogen aboard, Captain Janeway beams him aboard. Soon, the prey being hunted by this particular Hirogen, a member of Species 8472, boards the ship. The only immediate solution is to let the Hirogen loose on the ship to attack it prey.