When Worlds Collide: Part I

When Worlds Collide: Part I is the fifth episode of the fifth season of Teenage Mutant Ninja Turtles. It is a one-hour special episode.

Synopsis
The Newtralizer returns to New York more powerful than ever before and joins forces with a dangerous, unexpected ally; with the help of Mona Lisa, the Turtles fight back to defend their city.

Major Characters

 * Leonardo (Seth Green)
 * Raphael (Sean Astin)
 * Donatello (Rob Paulsen)
 * Michelangelo (Greg Cipes)
 * April O'Neil (Mae Whitman)
 * Karai (Kelly Hu)
 * G'Throkka/Sal Commander (Keith David)
 * Bishop (Nolan North)
 * Newtralizer (Danny Trejo)
 * Mona Lisa (Zelda Williams)

Minor Characters

 * Chompy
 * Renet (does not speak)
 * Scrorpinoid (cameo)
 * R'Kavaka (Nolan North)
 * Lord Dregg (Peter Stormare)
 * Earth Protection Force
 * Utrom Council
 * Queen (Cassandra Peterson)
 * Pawn (Nolan North)
 * Rook (Kate Micucci)
 * Utroms (Nolan North)
 * Space Heroes: The Next Generation
 * Captain Ryan (Brain Bloom)
 * Crankshaw (Scott Menville)
 * Shahana
 * Unidentified Alien Beast