A "weapon" of sorts developed by the Minyans, the pacification gun rendered the target docile and mentally innocent. The Minyans developed the technology too late to prevent the nuclear war on their planet. The R1C had a large, mounted pacification gun, which was used on Leela and Herrick. (TV: Underworld)
Behind the scenes
Many of the names and incidents in Underworld were derived from the myth of Jason and the Argonauts. Orfe's use of the pacification gun alludes to Orpheus' ability to calm savage beasts with his music. (INFO: Underworld, DOC: Into the Unknown)