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- Season 1 (1998)
- Season 2 (1999)
- Season 3 (1999)
- Season 4 (2000)
- Season 5 (2000)
- Joshua Tucci (1998-2000)
Billy in popular culture
- Dr. Billy-stein is the co-creator of the Super Silly-Ray, a device that can shoot out bubbles and make people laugh.
- In TBBC, he and his family (along with Gizmo Polie) are going to help the Polie family return the babies home. But the film demotes them to extra, making them supporting characters.
- In The Baby Bot Chase, Billy has minimal appearances after having a major role in The Great Defender of Fun.