(Ben 10 is seen in his Stinkfly form fighting Vilgax, who manages to grab him.)

Vilgax: You think you can destroy me now?

(Vilgax throws Ben down. Then he changes to XLR8.)

Vilgax: I analyzed each of your aliens.

(Vilgax grabs Ben's tail.)

Vilgax: And thanks to Optimus Prime, I can predict each of their attacks.

(Vilgax grabs Ben in the collar)

Vilgax: Nothing you can do will surprise me anymore.

(Then both Wonder Girls try to restrain him with their lassos, but Vilgax pulls them and grabs both of them in the neck. Kamen Rider Decade comes in, sees what's going on, and decides to draw an Attack Ride Card.)

Decadriver: AttackRide: Slash.

(Then Kamen Rider Decade slashes Vilgax, and then kicks him away.)

Decade: Get your hands off my girls.

(Then the Wonder Girls kiss his cheeks)

Decade: Get Ben outta here. I got this one.

(The Wonder Girls nod at each other and then they take Ben away, leaving Decade to face off Vilgax.)

Decade: You may know what your enemies can do, but do you know what I'm capable of?

Vilgax: You will suffer for interfering.

Decade: (pulls out a card) I don't think so. Henshin!

Decadriver: KamenRide: Wizard.

(Kamen Rider Decade becomes Kamen Rider Wizard.)

Decade: Now, it's showtime.

Vilgax: You will not stop me.

(They fight. Thanks to his Wizard Form's powers, Kamen Rider Decade overpowers Vilgax and defeats him. Lifting up his unconscious form, Decade strikes Vilgax with a right hook that sends him sailing into the distance.)

Decade: It turns out you don't know what I can do.

(Some minutes later in Metropolis. Kamen Rider Decade is walking the war-torn streets of the epic city.)

Decade: Lex Luthor doesn't respond to my hails. General Grodd says the metahumans' powers have been affected as badly as Ben's aliens' by Cybertron, if not worse. It turns out I'm the only heroe left to stand up to Optimus Prime.

(A portal suddenly opens behind Kamen Rider Decade)

????: Thanks to Optimus, soon my evil will be law in this world.

(Then a mechanical tendril grabs him and pulls him into Aku's domain.)

Decade: This place...such evil!

????: Flattery will get you nowhere, mortal.

(Then Mandrak, Mojo Jojo and Aku are seen.)

Aku: Mandrak. Entertain our guest.

Mandrak: As you wish, Master Aku.

Decade: Even with your technology, you will find out that I'm not easy to kill. (pulls out a card) Henshin.

Decadriver: KamenRide: Ghost.

(Kamen Rider Decade changes into Kamen Rider Ghost.)

Decade: Now bring it on, brat.

(They fight. Though the battle is fierce, Kamen Rider Decade's Ghost Form abilities manage to overcome the evil scientist, and Mandrak is knocked out for the count.)

Decade: Dexter is a better scientist than you, and he will always be.

Aku: Your mastery over transformations is exceptional indeed. But you will not be able to defeat me like that foolish samurai warrior.

Mojo Jojo: The kid was always an easy prey. It's me you should be worrying about.

Decade: (pulls out a card) In that case... Henshin.

Decadriver: KamenRide: Build.

(Now Kamen Rider Decade becomes Kamen Rider Build.)

Decade: Now, shall we begin the experiment?

Mojo Jojo: With pleasure, hero.

(They fight. After another round of brutal fighting, Kamen Rider Decade still manages to prevail and beats Mojo Jojo unconscious.)

Decade: This is the best.

Aku: Impressive... you fared well until now. But I'm afraid you can not undo the future that will be Aku.

Decade: (pulls out a card) You presume too much. Henshin.

Decadriver: KamenRide: Zi-O.

(Kamen Rider Decade becomes Kamen Rider Zi-O)

Decade: Now you'll feel the power of the Kamen Rider.

(They fight. Not even Aku's magic powers can defeat the might of Kamen Rider Decade, and the shape-shifting master of darkness is eventually knocked down. Decade picks him up and holds him.)

Decade: I've had enough of your games, Aku! I've beaten you and your demons! Now unless you want me to call Samurai Jack to kill you again, send me back!

Aku: As you wish...

(Decade releases him. Aku summons a portal to Metropolis and Kamen Rider Decade disappears through it. As he returns to Metropolis, Samurai Jack, Steven Universe, Finn, Jake and Lex Luthor come in.)

Jack: Excellent work, Kamen Rider Decade. You improved yourself considerably, and even managed to defeat Aku himself.

Decade: Yeah, but we still have one problem left.

Megatron: (comes in) Optimus Prime is almost coming here.

Steven: Megatron.

Decade: Let's join forces together and defeat Optimus Prime once and for all.

Heroes: YEAH!

(Kamen Rider Decade is ready for the biggest fight in his life. Will Lincoln White he able to defeat the autobot Optimus Prime?)