Star Trek: The Next Generation - Season 3 Episode 6 -

The Enterprise picks up ancient radio signal code from the ruined planet Aurelius 9, remnant of the total war over 1,000 years ago between Mentaurs and Promelians which caused both races' extinction. They find a Promelian battle-cruiser still floats in an asteroid field, so Picard, Data and Lieutenant Worf beam inside, finding a message from the captain he alone takes blame for all casualties. Barely back on board, they learn the Enterprise is immobilized by an energy-draining radiation field, the very booby trap that killed the Promelian ship's crew, which will ...