Ben 10: Omniverse - Season 7 Episode 5
Fight at the Museum

When Ester invites Ben (who brings along Rook to the formers dismay) to a museum exhibit displaying alien artifacts, they encounter Bens former crush Kai. When Ester discovers their relationship she immediately becomes jealous of her. The four of them are forced to team up, however, when a priceless exhibit that Kai put on display is stolen. Chrono Spanner also reappears again, this time trying to convince Ben that hes "destined" to marry Kai, to Esters chagrin.