The Evil of Dregg

"The Evil of Dregg" is the 12th episode of season 4 and the 90th of the overall. It aired on April 10th 2016.

Official Description
When Raphael loses his fighting mojo, he must overcome his feelings to save his brothers from certain doom.

Characters

 * Leonardo
 * Donatello
 * Raphael
 * Michelangelo
 * April O' Neil
 * Casey Jones
 * Fugitoid
 * Mona Lisa
 * Sal Commander
 * Lord Dregg
 * Armaggon
 * The Vreen
 * Scorpinoid
 * The Xaxx Bees

Trivia

 * First and only appearance of Scopinoid and The Xaxx Bees.
 * Last appearance of Armaggon.
 * Mona Lisa and Sal Commander return in When Worlds Collide.
 * The pit that Leo, Raph, Mikey, and Casey are thrown into is a shout-out to the Pit of Carkoon, home of the Sarlacc inReturn of the Jedi. Also, Armaggon, being a bounty hunter, meets a similar fate to Boba Fett when he is dragged into the pit and it belches afterwards.