Dexter's Laboratory

'Dexter's Laboratory' is an American animated television series. It follows boy-genius Dexter, who ends up in various hijinks due to either his intellect or other characters such as his hyperactive sister Dee Dee or his rival Mandark, another boy-genius.

S3E43: Inflata Dee Dee
Dee Dee wears Dexter's hydro-plasmic suit, which inflates and causes her to float up into the air. Dexter gets into a battle with his ballooning sister as he tries to get her back to the floor.