Nickelodeon Leonardo X Rise of the Teenage Mutant Ninja Turtles Leonardo

Leo can't believe it. 4 other mutant Turtles fell out of some purple portal and landed in the lair. They claim that their names are: Leonardo, Donatello, Michaelangelo and Raphael. Who are they? Are they Spies from Shredder? So basically this is a Story where Leonardo (Nickelodeon version) meets Leonardo (Rise of the...