Warhead

Voyager answers a distress signal from an uninhabited planet and finds a damaged machine that appears to be a sentient artificial intelligence in need of help. At the Doctor's urging, it is brought aboard so it can be treated. While B'Elanna Torres and Harry Kim examine it, they discover the truth: it is a weapon of mass destruction, a smart bomb whose damaged memory has left it believing its mission is still under way. The warhead takes over the Doctor's holographic matrix, traps Kim and Torres in sickbay, and threatens to detonate unless Voyager carries it to its target. By repairing its memory, the crew learn it was one of 32 warheads launched by the Druoda, and that the war ended long ago without the recall reaching it. When more warheads from the same group approach, Kim convinces the weapon of the truth, and it sacrifices itself to stop the others.