Princess Celestia, Princess Luna, Princess Twilight Sparkle, Princess Mi Amore Cadenza, and Discord play a game of BS.

Luna challenges Rainbow Dash to a race, and Rainbow ends up flying past the speed of light, time-traveling into the future.

When they land, they discover Equestria has changed a lot.

Ultimate Prank War is on!

Prank war between the four Alicorn Princesses. Nothing could possibly go wrong. Four princesses, four times the fun!