This is how The Mane Six meet the Autobots goes in My Little Pony Transformers.
[Bumblebee drives the Mane Six into a place where they are not allowed to enter]
[The camera shows the audience four metal like comets heading for Equestria]
[The camera shows Major Malfunction hiding in the bushes come out and head for the police station]
[The comets lands]
[Ratchet, in protoform mode, scans a Hummer H2 rescue vehicle and transforms]
[Jazz, in protoform mode, scans a Pontiac Solstice hardtop and transforms]
[Ironhide, in protoform mode, scans a GMC Topkick truck and transforms]
[Major Malfunction, in protoform mode, scans a police car and transforms]
[Optimus Prime, in protoform mode, scans a Peterbilt 379 semi truck and transforms]
[The Autobots arrive and transform]
Optimus Prime: Are you Princess Twilight Sparkle, daughter of Night Light and Twilight Velvet, sister of Prince Shining Armor, sister-in-law of Princess Cadance, and former student of Princess Celestia?
Twilight Sparkle: Yeah.
Optimus Prime: My name is Optimus Prime. We are autonomous robotic organisms from the planet Cybertron.
Ratchet: But you can call us Autobots for short.
Twilight Sparkle: Whoa.
Rainbow Dash: Awesome.
Pinkie Pie: Wow.
Optimus Prime: [points to Jazz] My first lieutenant, Jazz.
Jazz: This looks a cool place to take it.
Pinkie Pie: Hi, I'm Pinkie Pie! I like you!
Jazz: I like you too.
Twilight Sparkle: How did he learn to talk like a human?
Optimus Prime: We've learned Equestria's languages through the internet. [points to Ironhide] My weapons specialist, Ironhide.
Ironhide: You feel lucky?
Optimus Prime: Easy, Ironhide.
Ironhide: I'm just kidding. I just wanted to show them my cannons.
Rainbow Dash: Neat.
Optimus Prime: [points to Ratchet] My medical officer, Ratchet.
Ratchet: [sniffs at Fluttershy]
Fluttershy: I would rather you not do that.
Optimus Prime: [points to Major Malfunction] Our loyal Autobot trainer, Major Malfunction.
Major Malfunction: Good to meet ya.
Optimus Prime: [points to Bumblebee] You already know Rarity's guardian, Bumblebee.
Rarity: My guardian?
Bumblebee: [assumes fighting stance] Check to the rep/Yep, second to none.
Rainbow Dash: Why does he talk using the radio?
Ratchet: His vocal processors were damaged in battle. I'm still working on them.
Applejack: Why are you here?
Optimus Prime: We are here looking for the Allspark and we must find it before Megatron.
Twilight Sparkle: Mega-what?
Optimus Prime: [produces a hologram of Cybertron for the Mane Six to see] Our planet was once a powerful empire, peaceful, and just, until we were betrayed by Megatron, leader of the Decepticons. All who defied them were destroyed. Our war finally consumed the planet and the Allspark was lost to the stars. Megatron followed it to Equestria, where Starswirl the Bearded found him.
Twilight Sparkle: I read all about Starswirl the Bearded.
Optimus Prime: It was an accident that intertwined our fates. [flashes back to Starswirl the Bearded's discovery of Megatron in the ice] Megatron crash-landed before he could retrieve the Cube. He accidentally activated his navigation system. The coordinates to the Cube's location on Equestria were inprinted on the Element of Magic.
Twilight Sparkle: How did you know about the Element of Magic?
Optimus Prime: I learned it from a book I read.
Twilight Sparkle: Oh.
Ratchet: If the Decepticons find the Allspark, they'll use its power to transform Equestria's machines and build a new army.
Optimus Prime: And the equine race will be extinguished. Princess Twilight Sparkle, you hold the key to Equestria's survival.
Twilight Sparkle: Me? Why me?
Optimus Prime: Because you are the fourth alicorn princess.
Twilight Sparkle: Well, if you're sure.
Optimus Prime: I am certain of it.