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|Age||29 (Ben 10)|
|Relatives|| Gordon Tennyson (father)|
Betty Jean Tennyson (mother)
Max Tennyson (uncle)
Camille Mann-Tennyson (wife)
Carl Tennyson (cousin)
Frank Tennyson (cousin)
Ben Tennyson (cousin once removed)
Gwen Tennyson (cousin once removed)
Mr. Mann (father in-law)
Mrs. Mann (mother in-law)
Lucy Mann (cousin in-law)
|Voice Actor||Dee Bradley Baker|
|First Appearance||Big Fat Alien Wedding|
Joel fought in a war between the Plumbers and the Lenopans. During the conflict, he met and developed a relationship with a Lenopan named Camille, and they became engaged, in hopes of reaching a truce between the two sides.
In Big Fat Alien Wedding, Joel prepares for the wedding. While the ceremony did not go as well as planned due to Camille's parents, the marriage was made successfully.
- Big Fat Alien Wedding (first appearance)