Star Trek: Voyager - Season 2 Episode 17 -

Voyager comes across a ship that has been destroyed, upon investigation they discover that B'Elanna Torres is responsible! Dreadnought is a self guided missile created by the Cardassians to destroy the Maquis, however the bomb failed to go off allowing B'Elanna to get inside the missile and re-program it to do the Maquis' bidding.