When Worlds Collide

"When Worlds Collide" is a 1 hour episode. It is the 5th and 6th episode of season 5 and the 109th and 110th of the overall. It aired on June 18th 2017.

Official Description
When Mona Lisa suddenly arrives on Earth, Raphael must get her and Bishop to work together to defeat an alien threat and save the Earth.

Characters

 * Leonardo
 * Donatello
 * Raphael
 * Michelangelo
 * April
 * Karai
 * Chompy
 * Mona Lisa
 * Sal Commander
 * Bishop
 * Newtralizer
 * Lord Dregg
 * Queen
 * Porn
 * Rook
 * R’Kavaka
 * Ultroms
 * Earth Protection Force
 * The Vreen
 * Renet (does not speak)

Trivia

 * First and only appearance of R'kavaka.
 * Lord Dregg and Newtralizer die in this episode.
 * Last appearance of Lord Dregg, Newtralizer, Sal Commander, The Vreen, Queen, Rook, Porn and the Ultroms.
 * Mona Lisa stays on earth to be close to Raph and join the Mutanimals
 * When April uses water to short out Newtralizer's tech, she creates the illusion that she's waterbending, similar to Katara from Avatar: The Last Airbender, who Mae Whitman also provided the voice of.
 * The Newtralizer is defeated the same way as Darth Sidious in Return of the Jedi.
 * This episode reveals the following:
 * G'Throkka has a bionic eye because Newtrailzer took out his real one and left him to perish by his wound.
 * Michelangelo has kept in touch with Renet.
 * Salamandrian's are forbidden in Earth's galaxy.
 * Lord Dregg survived after being sucked out into space by the Triceratons in the episode "The Ever-Burning Fire".
 * Newtralizer's real name is K’Vathrak.