Samarjit is in the trenches of World War I. His British army mates volunteer him for a dangerous mission. Captain Oakes introduces him to Dr Smith. Samajit accompanies Dr Smith through enemy lines. They next find a deep impact crater, at the bottom of which is a stone building. The Doctor pockets something that he finds. Next, the Doctor explores the surrounding area and examines every spent bomb he finds; when he finds one that hasn't detonated, he takes its parts with him back to the crater. As he starts to set the bomb for detonation, Samarjit is shot.