The Knockout-Ray is one of Sandy's inventions. It is seen and used in the episode, "Spy Buddies." It puts people to sleep.
The Knockout Ray resembles a small ray gun. It is small, and looks lightweight.
Role in the series
Sandy tells SpongeBob and Patrick that it is her personal favorite out of her various inventions. Sandy shows a demonstration on both SpongeBob and Patrick. After Sandy laughs and wouldn't let them take the gadgets, Patrick uses the Knockout Ray to knock Sandy unconscious.