Sapphire & Steel (1979)

Season 2: Episode 3

After Sapphire narrowly saves Steel from meeting the same fate as the doomed fighter pilot, Steel becomes determined to figure out why the ghosts are being recruited at the station. Since the ghosts have such strong emotions, Steel tries to anger the soldier into appearing by singing an old military marching song with Tully. Steel's tactic works a little too well and the soldier takes out his anger on Sapphire and Tully.