Get Smart (1965)

S1E7 KAOS in CONTROL

CONTROL is set to hold a prestigious conference featuring six of the world's brightest scientists, but KAOS has sinister intentions involving a retrogressor gun. Just before the event kicks off, a KAOS operative successfully steals the device, which has the power to mentally regress adults to childhood. The mole turns both the gun's creator and the Chief into children. KAOS aims to incapacitate the scientists, crippling the free world's intellect. Max steps up to lead the conference and, drawing on his knowledge of Captain Kangaroo, manages to outsmart the mole and thwart their plan.