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She has black hair, blue eyes, and wears glasses.
In Big Fat Alien Wedding, her son Joel became engaged to a Lenopan, named Camille Mann (a union which would put an end to a decades long feud between the Sludges and the Plumbers). Both she and her husband were against the wedding at first (due to Camille being a Lenopan), but later realized they had treated her unfairly and apologized, accepting Camille as their daughter-in-law.
- Big Fat Alien Wedding (first appearance)
She was named after her voice actress, B. J. Ward.
- Betty Jean is one of few known female members of the Tennyson family who is a member of the Plumbers.
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