A standard gadget in the Mad Scientist grab bag. The Hypno Ray allows the user to instantly hypnotize an unsuspecting target and make that person do their evil bidding. Often a Ray Gun, but the magical version usually takes the form of Eye Beams. The sequence follows a standard progression: The victim later hears the trigger and takes the action, no matter how inappropriate it may be at the time. This can often be combined with a mass media event to Take Over the World. These days, this type of device is usually limited to comedic settings. A Sub-Trope of Mind Control Device.