The Pacifier (Sky High)

The Pacifier is a weapon creted by the villiam Royal Pain, it is featured in the 2005 film Sky High,

Powers
The Gun has the ability to turn people back into babies. The effects are permament to a point. Someone that was turned into a baby can continue to grow up again, Professor Medulla was later able to scientifically reverse the process.

History
Royal Pain invented the weapon to turn Heros into babies so she couls raise them as villians. She was defeated by The Commander and Jetstream. During the battle, the gun was damaged and turned Royal Pain back into a baby. The Commander then takes the Pacifier as a trophy and stores it in his secret lair.

Sixteen tears later, Royal Pain plots to steal back the Pacifier from The Commander, using his son Will Stronghold. When she gets the wearpo back she again uses it to try to turn the Heros into babies. She manages to turn most of Sky High School's staff into babies, before she was defeated by Will.