Gleam: Be my wife alongside my communist reign, Twilight!  
Twilight: Hell what?  
Gleam: OR ELSE!!! GULAG!!  
Twilight: !!!

Starstruck Comet (Joker): laughs maniacally and emerges from the form of a Ponified Megan Williams “Hello, citizens of Canterlot! Starstruck Comet is in town!” more insane laughter “Oh, I NEVER get tired of that!”
 
Sunset Shimmer: shocked “It can’t be!”
 
Shining Armor: in a cold panic “What are you doing here?! How did you even get here!?”
 
Starstruck (Joker): removes Megan’s bow “HA! You flabby cowards don’t even know what you’re all dealing with! Beneath this puckish air lies the unicorn horn of a genius moons ahead of my time. In the weeks, Megan Williams was under my tutoring; I used her as the test subject of my greatest experiment! Utilizing cutie mark genetics technology, which I had pinched here there and everywhere, I encoded MY DNA on a microchip and set it into human-turned-pony girl’s human-turned-pony brain!” camera pans at what a appears to be a teeny tiny little robot revealed attached to the skin the back of Starstruck’s neck “Everything that used to be me has been sleeping all comfy and cozy inside Megan Williams’ sub-conscience. At first, I had to limit the time I spent in Megan’s body. She’s not blissfully aware of what I do. Lingering any moments from bad dreams to real nightmares. If her family and friends ain’t here, I simply call siblings and tell them…” imitates Megan’s voice “I’m working late with Twilight, you two! I’ll see you both in the morning!” normal voice “The transformation has come at will now! And soon I’ll be smart, fast and strong enough to live in this mare’s body permanently.”
 
Twilight (Bruce Wayne): already captured in stasis by Starstruck “No! You can’t do that!”
 
Starstruck (Joker): brings Twilight closer to him and their muzzles touch “Oh no, your purple-hued eyes do not deceive you, Sparky. After all, you know me better than anypony else.” levitates Twilight away from his face “STARSTRUCK COMET IS ON THE REBOUND, MARES AND GENTLECOLTS! My resurrection party is going to set both Mankind and Ponykind on fire!” presses a few buttons on a remote control

@Lillian  
I guess starlight’s meddling with the timeline had some… unusual effects, not that they remember any of it though

“S-Starlight? _{What the heck?}”

so smug