The Earth's Plumbers and the Lenopans were involved in a decades-long feud, before it was ended by the marriage of Plumber Joel Tennyson and Lenopan Camille Mann

In Big Fat Alien Wedding, Joel was about to get married to his alien fiancé, but Camille's family objected to her marrying a human. During the rehearsal dinner, Camille's ex-boyfriend disrupted the reception to forestall suspicion upon the parents, but he was quickly dealt with by Ben as Diamondhead.

During the wedding, the Mann family and another Lenopan disguised as a wedding staff member interrupted it, destroying everything. Ben turned into Heatblast to face the Manns, but later in the fight, they merged into one being. The Lenopans captured and engulfed Ben, dragging him into their body. They thought they had won, but were defeated from the inside by Heatblast's heat, which dried and solidified them into a brittle mass. Joel and Camille finally got married, which put an end to the decades-long Plumber/Lenopan feud once and for all.