Inhibitor helmet



The Inhibitor helmet is a device that neutralizes the powers of any Android, Sayian, and half-sayians. Also, the inhibitor helmet immobilizes any human.

History
When Gohan, Megan, Videl, and Android 18 were captured by a group of underground humans,  they woke up and find the inhibitor helmets on their heads and get placed into separate rooms. However, Bulma and Chi Chi tried to rescue them and eventually get captured right as Pan sneaks in and frees her friends and family.