The Onion is a villain in the Richie Rich series of comic books and cartoons. He first appeared in the comic book series around 1975, and by 1981, he joined the organized crime ring known as Villains, Inc., along with Dr. Blemish and Dr. Disguise. The trio of crooks made their only animated appearance on the fourth episode of the second season of The Richie Rich/Scooby-Doo Show in October 1981.
The Onion was most noted for his strong breath from obsessively eating raw onions, which is designed to deter intruders from trying to foil his crooked schemes. In a 1976 issue of SupeRichie, The Onion's breath was proven to be so powerful, it would became a new energy source known as Onioneen, functioning similar to gasoline.