In this episode, the villain —a Galvan trapped in a human form similar to Ben's—orchestrates a plan to obtain a device that will restore his original form.
Albedo successfully switches places with Ben Tennyson, sending Ben to the Plumber HQ prison while he infiltrates the team. [S2E17] The Ultimate Heist
While the show is famous for its "Halloween Heist" episodes, fans sometimes refer to the grand finale or specific high-stakes heist episodes (like "The Last Day") using similar titles. "Ben 10: Omniverse" The Ultimate Heist (TV Episode 2013) In this episode, the villain —a Galvan trapped