Everyone has done it at some time. Made that wish upon a falling star, or otherwise gazed longingly with hope into the night sky. Though maybe, we've just been doing it at the wrong time.
Maxwell is a physicist, on his way to finally having his Ph.D, and getting tired of the seemingly minimal impact his work will have in the field as a whole.
That is, until he makes his wish.
Now he's in a bright world full of bright ponies. Also they can talk. And do magic. And fly.
Having hooves is going to take some getting used to.