Inspector Gadget

Inspector Gadget is a 1983 Belgian-Canadian-French series revolving around Inspector Gadget, a secret agent enhanced with a limitless supply of doo-dads, and his niece, Penny, who secretly keeps her uncle safe and cracks the case, as they battle the forces of M.A.D, a sinister organization bent on world conquest.

A Star is Lost (Season 1, Episode 11)
M.A.D kidnaps a rock star, Rick Rocker, with the intent of brainwashing him using a record and taking control of his legions of fans. He first uses it on Rick, which causes him to fall asleep. Later, Penny finds Rick and tries to save him, but she ends up being hypnotized by the record as well and falls asleep. The same fate later falls upon Gadget, but he passes out on the record player, which frees everyone.

Follow That Jet (Season 1, Episode 51)
Dr. Claw uses a mind-controlling video game to hypnotize military pilots into stealing their fighter jets and joining his own M.A.D. Air Force. Dr. Claw nearly gets a chance to hypnotize Gadget as well, but in a rare moment of competence, Gadget says he ought not be distracted while on duty.

Snakin' All Over (Season 1, Episode 57)
Gadget is called to guard a priceless coin collection, but a M.A.D. agent by the name of Professor Venom uses his trained snakes to steal them, one snake of which is able to hypnotize anyone.

Quiz Master (Season 1, Episode 61)
Gadget investigates a TV quiz show where contestants are hypnotized into robbing Armored cars and unwittingly becomes hypnotized himself while trying to win a new toaster.