Inside Mount Rushmore, the Tennysons and Cooper must guard the highly unstable sub-energy orb from the Forever King and the newly-formed Negative Ten.
Tropes
- Be Careful What You Wish For: Charmcaster berates Gwen for not doing more with her magic powers. Gwen ends up trapping the villains other than Driscoll and the Forever Ninja with a spell.
- Brainwashed and Crazy: Sublimino controls Cooper in order to get pass the Tennysons' defenses.
- Bring It: Ben says this before he and his family engages the Negative 10 in one final battle.
- Containment Field: The Sub-Energy is protected by a sonic force field, requiring special equipment to even see.
- Continuity Nod: Ben asks if Max still has anymore hologram projectors to cover up Mt. Rushmore's destruction as a nod to the final episode of the first season.
- I Lied: Cooper reveals at the end that he doesn't have the movie ticket Ben and Gwen wanted and he only lied so that the two would talk to him.
- Laser-Guided Karma: Upchuck blasts the Forever King with the energy source that he wanted to use for his own ends.
- Lock-and-Load Montage: Ben, Gwen and Grandpa Max have a brief one in the climax as they prepare for the Negative 10 to arrive.
- Monumental Damage: Mount Rushmore gets destroyed in the battle between Ben and the Big Bad. For the second time.
- Noodle Incident: Ben has already unlocked Eye Guy prior to the events of this episode.
- The Reveal: The Forever King is actually an ex-Plumber named Driscoll and he leads the Forever Knights and the Negative 10 to get the Sub-Energy.
- Sealed Evil in a Can: Gwen traps the remaining Negative 10 in a force field.
- Talking Your Way Out: Ben and Gwen turn the Negative 10 against each other by manipulating their rivalry over one another.
- You're Insane!: After Max warns Driscoll about the Sub-Energy's instability, this reply happens.Driscoll: Funny, that's what the Plumbers said about me before they kicked me out.
