(Y/N is seen as Optimus Primal in its gorilla form, setting to find Aku's hideout.)

Y/N: Well, I need to deal with Aku, Mandrak, Vilgax and Mojo Jojo. But there's more than them. I'll be facing some other villains as well. If I'm correct, they're Albedo, the Rowdyruff Boys, Scaramouche the Merciless, Charmcaster, Fuzzy Lumpkins and the daughters of Aku. But there's also some other villains like Deathstroke, Jasper, Professor Pericles and Ice King.

(Then the Teen Titans, Steven Universe, The Mystery Inc., Finn and Jake come in.)

Robin: My suspicions have been confirmed. Slade is lately working for Aku and helping him in his quest to conquer the world. 

Steven: We gotta stop them.

Beast Boy: You know what time it is?

Raven: Please, not now...

Finn/Jake: ADVENTURE TIME!

Robin: Remind me to not let Beast Boy ask stupid questions when Raven is around. 

Starfire/Cyborg: Yyyyyyep.

Robin: But for now... we must go after Slade.

(Then some of Aku's minions come in and charge at the heroes, only to be overwhelmed by Y/N's Optimus Primal form. After destroying them, the heroes find the palace Aku is hiding.)

Y/N: This must be Aku's domain.

Beast Boy: And I thought it was far far away.

Robin: Appearances can be deceiving. 

Cyborg: Hey, Y/N. This is one of your other forms, right?

Y/N: Yes, what of it?

Cyborg: I watched alternate versions of myself taking his teammates to determined places through Boom Tubes. Perhaps I can try to enter in his palace through it.

Robin: That's a good plan, Cyborg. Do you think you can do it?

Cyborg: It's worth to try.

(Cyborg then combines both of his artificial intelligence and human intellect, managing to open a boom tube.)

Jake: It works.

Y/N: Just to be sure.

(Y/N enters the boom tube and ends up inside the palace.)

Y/N: That worked.

(Then the heroes get through the boom tube and they proceed to the first floor, where they see two individuals, namely Deathstroke and Mandrak.)

Mandrak: So you found this place.

Y/N: It wasn't hard to get in here. If it weren't for Cyborg, we would be probably noticed. 

Robin: Yeah, he did a great job leading us to you, Slade.

Deathstroke: Presumptuous as usual, Robin. No wonder you're just the shadow of the bat.

Y/N: Well, enough talk. We're here to take you down.

Mandrak: You're right. Quite enough. Have at you. 

(Then two mechs come in, and then Mandrak and Deathstroke get in them.)

Y/N: Well, it's clobbering time.

Robin: Titans, attack!

Finn: Okay, Jake. You know what to do.

Jake: Yeah, yeah!

(Then the heroes charge at the mechs as they shoot some missiles. Raven uses her magic to stop the missiles while Starfire blasts them down. Slade's mech heads for Robin.)

Robin: (smirks) That's right, Slade. Come and get me.

(Then Robin slides under Slade's mech, giving a chance for Steven Universe to cut one of its legs with his sword.)

Robin: Beast Boy,  grand slam.

(Beast Boy then jumps as high as he can, and then transforms into an elephant to crush Slade's mech. Deathstroke gets out of it in time as Beast Boy crushes the mech. Y/N as Optimus Primal, lifts Mandrak's mech and throws it down.)

Y/N: Your turn, Raven.

Raven: Azarath Metrion Zynthos. 

(Raven lifts some pillars and damages Mandrak's mech in the legs severely. Meanwhile Jake becomes giant, grabs Deathstroke, and then throws him down as Finn is about to kill him with a sword, but Slade dodges it, only to get kicked in the face by Robin.)

Robin: You're done, Slade.

(Y/N as Optimus Primal, rips off the legs of Mandrak's mech.)

Mandrak: I'm not done yet!

(Mandrak shoots a barrage of missiles, but Raven and Steven Universe combine their powers to shield the group. Then Y/N breaks Mandrak's mech to the point it becomes beyond repairs.)

Mandrak: Damn you.

Y/N: You failed, Mandrak. Give it up.

(Then the Justice League comes in)

Batman: You did a great job, Y/N. But it's only the beginning. 

Superman: We found out about Luthor's possible involvement with Aku.

W. Woman: Which means the Legion of Doom is involved in this, and that includes Slade.

Y/N: So we have to deal with more villains.

G. Lantern: Exactly.

(Then Y/N transforms into G1 Optimus Prime)

Y/N: Then let's go to the second floor.

Raven: And fast.

(To be continued)