This is how At Summoner's Rock and Meet Danny Phantom and Spongebob goes in My Little Pony Transformers Prime: Battle for Volcano Island.
[On Volcano Island, crabs are chanting as heads of Nicktoon characters, the Autobots, Hero Factory Heroes and Equines float round the tip of a giant rock]
Wise Old Crab: We can wait no longer. It is time. Only the heroes can save us from the evils of...the Dark One.
Thunderwing: Fools! You cannot stop me! This world will soon belong to Unicron!
[He shoots lightning at the Wise Old Crab's staff]
Wise Old Crab: Not... yet... it isn't!
[The lightning stops and the stone heads scatter]
Crab: He has broken the circle! The heroes will be lost!
Wise Old Crab: Not lost, just scattered. And not all of them: Look!
[He points to the sky. The shape of Optimus and Twilight Sparkle tumble through the air]
Twilight Sparkle: [uses her wings and lands safely] Wow. This doesn't look like Equestria.
[Optimus lands next to her]
Optimus Prime: Or Cybertron.
Wise Old Crab: Ah, "The Metal Man" and "The Lavender Princess". You have arrived.
[Optimus and Twilight look at him]
Wise Old Crab: We must find "The Ghost Boy" and "Absorbant Yellow One".
Twilight Sparkle: "The Ghost Boy"?
Optimus Prime: "Absorbant Yellow One"? Please, tell us more, wise bearded crustancain.
Wise Old Crab: I have summoned you here for a purpose. Our ancient enemy, the Dark One, has escaped from his prison and seeks vegeance.
Twilight Sparkle: The Dark One?
Optimus Prime: Who is this Dark One?
Wise Old Crab: A big metal monster with big pink wings.
Twilight Sparkle: [gasps] No.
Optimus Prime: Crustancain, that being is Thunderwing.
Wise Old Crab: Thunderwing? I do not know who you're talking about.
Twilight Sparkle: He is the only one with big pink wings.
Optimus Prime: A powerful follower of the Chaos Bringer, Unicron.
Wise Old Crab: Anyways, he has created a terrible ooze that corrupts everything it touches. But the legends of our people say that you - the Chosen Ones - can save us!
Twilight Sparkle: But how can we save you?
Optimus Prime: Please tell us.
Wise Old Crab: You will know, Lavender Princess; you will know. But first, you must find all of your friends. United, you will triumph!
Crabs: Hoo haah!
Wise Old Crab: Please stop that. Now follow me and I will take you to a safe place where you can camp.
[Jawblade is seen with Spongebob and Danny Phantom cornered]
Jawblade: Looks like you two are toast. [brings out his Magma Blades]
[Before he can attack them, Furno, with his Aqua Jetpack, appears out of nowhere and saves them]
Furno: Hey, Jawblade, how about you pick on someone your own size?
Jawblade: What? Where did you come from?
[Furno and Jawblade fight. After a while, Furno cuffs Jawblade]
Jawblade: No! What did you do?
Furno: Well, I caught you and I cuffed you.
[He leads him away as Danny and Spongebob peek out from their hiding place]
Danny Phantom: Who is that?
Spongebob Squarepants: I actually have no idea.
[Furno comes back]
Furno: It's okay, I'm a good guy.
[Optimus and Twilight show up]
Danny Phantom: A unicorn?
Spongebob Squarepants: And a robot?
Optimus Prime: I am an autonomous robotic organism from the planet Cybertron. But you may call me an Autobot for short. I am Optimus Prime, their leader.
Twilight Sparkle: And I am Princess Twilight Sparkle.
Furno: And I'm William Furno.
[A door lands on Spongebob]
Furno: Didn't see that coming.
[Cars land on the island]
Danny Phantom: What are those?
Spongebob Squarepants: They're called cars.
Optimus Prime: No just any cars.
Twilight Sparkle: Danny Phantom and SpongeBob...
Furno: Prepare to meet the Autobots!