'The Rise of' Princess Big Mac
Recap: Big Mac is an ordinary earth pony who lives happily with the apple family. In his dreams he has super adventures with his unicorn horn. One night he has a dream of everyone in ponyville being there which included Princess luna...
Soon Big Mac found himself cornered by evil nightmare monsters, not even his powerful unicorn magic could overcome this! Was this the end to his adventures? Would this scar his dreams forever?
Big mac! You can do anything in this dream, Remember?!
The mutant cupcakes were drawing nearer but big mac hadn't lost hope, thanks to that brave quote from his sister Apple Jack.
He thought hard and then suddenly there was a blinding flash of light!
Big lumps began to grew from Big Mac's sides, his eyes had red stars in and a metal ornament appeared on his head! The lumps poofed out into big wings, his dream horn grew bigger on the ornament on top of his head was in fact a crown with his cutie mark on it!
Big mac had transformed himself into an alicorn 
(Princess~though he didn't change gender...)
Being a unicorn was one thing but Big Mac's newest dreams were of 'Princess Big Mac'
Thank you for reading and if reading bored you here is the video
Youtube Video