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Ben 10 Season 4: Episode 43: Big Fat Alien Wedding

Ben, Gwen, and Grandpa Max attend a family wedding. Ben’s Uncle Joel is to be married to his fiancée, Camille. It turns out that Camille is no ordinary human being, but the purpose of their marriage is to end the fighting between her alien race, the Sludges, with the Plumbers. Unfortunately her parents disapprove the marriage at the last minute and attack the family during the ceremony. Can Ben stop these wedding crashers, or will the aliens take over the wedding and Ben?