Joel Tennyson

Appearing in "Big Fat Alien Wedding," Joel is Max's muscular nephew and a fellow member of the Plumbers. Having developed a relationship with an alien Sludge named Camille Mann(despite there being a war between the Plumbers and Sludges for years), Joel marries her in hopes of reaching a truce between the two sides. While the ceremony did not go as well as planned thanks to the bride's parents, the marriage was made successfully with the Tennyson's aid.

Trivia

 * Unlike his cousins, Carl & Frank, Joel is fully aware off The Plumbers & the existence of aliens. As an adult he joined The Plumbers, which lead to his meeting & falling in love with Sludge, Camille Mann.
 * Joel & his uncle Max, are the only known members of the Tennyson Family to have either dated or married females of an alien species(Joel dated & married the Sludge, Camille. Max once dated the alien Xylene, but suprisingly, he dated, married, and had two kids with the Anodite, Verdona).
 * It can be assumed that if Joel & Camille have a child, that it will likely be a Human/Sludge hybrid.