This is how At the asteroid belt and Unicron's return goes in Thomas and Friends: Transformers Prime: Friendship is Magic: Beast Hunters: Predacons Rising.
[The trio reach their destination]
Wheeljack: Why send the Allspark to Theta Scorpii, one of the most hazardous star systems in the galaxy?
Optimus Prime: Precisely to deter Megatron from searching this region for it.
Twilight Sparkle: Wow. Some story.
Wheeljack: With all the gamma bursts and planetoid collisions out here, how can you be sure it survived?
Optimus Prime: The Allspark itself is comprised of pure energy. In order to contain it and launch it off-world, Alpha Trion forged a vessel capable of extracting it from the ether. It is this indestructible reliquary we seek.
Twilight Sparkle: Whoa.
Wheeljack: Well, I'll try not to scratch the paint on this tub, but no promises.
Optimus Prime: We cannot risk being stranded if our ship is damaged. It is best that you remain here, Wheeljack.
Twilight Sparkle: Unless we run into trouble.
Wheeljack: You're the bosses.
[They begin to enter, unaware of a space storm approaching them]
[Back at Darkmount, Smokescreen and Pinkie Pie sit on the Darkmount throne]
Smokescreen: "Lord Smokescreen" Emperor of Destruction.
Pinkie Pie: "Lady Pinkie Pie" Empress of Extermination.
[Bulkhead and Applejack turn to them]
Bulkhead: How can you sit there? That's some bad mojo.
Applejack: Yeah. Get off there.
[With Bumblebee, Rarity, Arcee, and Rainbow Dash]
Bumblebee: What do you know? Knock Out actually shot straight for once.
Rarity: Even the most fashionable Decepticons can be helpful.
Arcee: What'd you have to do? Buff his finish?
Rainbow Dash: [scoffs] As if.
Bumblebee: Close. Let's download the data and get out of here.
Rarity: You heard him, let's move, darlings.
Bulkhead: Hey. Something's heading our way.
[They look out to space]
Rainbow Dash: Queen Chrysalis?
Bumblebee: Moving too fast.
Rarity: Even for an object.
Applejack: Lord Tirek?
[Unicron arrives and transforms]
Unicron: Minions of the Prime, prepare to be obliterated!
Rarity: But you're dead.
Smokescreen: You skewered buckethead with a giant saber and managed to miss his Spark?
Pinkie Pie: That is weird.
Arcee: How are you still alive?
Rainbow Dash: Yeah, what's going on?
Bulkhead: And where'd you score the upgrade?
Applejack: And what's with all the extra armor?
Unicron: Megatron cannot answer you at this moment, though I can inform you with utmost authority that he owes his new lease on life to me Unicron! And I will not be so easy to deliver into oblivion.