Nicktoons Holiday Crossover is a crossover that will air on December 24, 2015. It is the sequel to Jimmy Timmy Power Hour III and Nicktoons Unite!. It also marks the 25th anniversary of Nicktoons, although the first three Nicktoons didn't air until 1991. It starts out with Ren Chihuahua and Stimpy Cat decorating for Christmas, when Jimmy Neutron, Timmy Turner, SpongeBob SquarePants, Danny Phantom and thier friends show up, who have befriended the Rugrats, CatDog and Winslow. However, they must fight The Anti Fairies, The Pixies, Sheldon Plankton, Angelica Pickles, The Greaser Dogs and Roger Klotz. At the end, Quailman and Quaildog save the day and reveal that they are Doug Funnie and Porkchop and celebrate Christmas.