Betty Jean is a human female member of The Plumbers who married fellow Plumber, Gordon Tennyson (brother of Max Tennyson). She is also the mother of Joel Tennyson, who later became a Plumber himself.

In the episode Big Fat Alien Wedding, her son is engaged to a Sludge Alien, named Camille Mann (a union which will put and end to a decades long feud between the Sludges & the Plumbers). Both she and her husband are against the wedding at first (due to Camille's being a Sludge), but later realize they had treated her unfairly & apologize for their behavior, accepting Camille as their daughter-in-law.

Voiced by B.J. Ward.


  • She is one of few known female members of the Tennyson Family who is a member of The Plumbers. Currently she and Gwen Tennyson are the only known active female Plumbers in the Tennyson Family.
  • Her name may be a parody of Billi Jean Jackson of the song of the same name
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