Revenge of the Triceratons

 "Revenge of the Triceratons" is the 11th episode of season 4 and the 89th of the overall. It aired on April 3rd 2016.

Official Description
Donatello is feeling inferior to Fugitoid, but his intellect is put to the test when the Triceratons attack.

Characters

 * Leonardo
 * Donatello
 * Raphael
 * Michelangelo
 * April O' Neil
 * Casey Jones
 * Fugitoid
 * Mozar
 * Zax
 * Triceraton Soldiers
 * Skeevix Virus

Trivia

 * First and only appearance of the Skeevix Virus.
 * When the Ulixes' warp engine is hit right before they can make the tachyon jump, the sound of the warp engine shutting down sounds like the Millennium Falcon from Star Wars Episode V: The Empire Strikes Back when it tries to jump to lightspeed, only to find that the hyperdrive is either damaged, or disabled thanks to Imperial agents.
 * The Space Gremlins are a direct reference to film Gremlins.
 * Casey kills one in the food maker in a way similar to how the mother shoved a gremlin in a microwave killing.
 * Professor Honeycutt reveals that Earth's science is 3000 years under galactic standards.
 * Donatello uses the 10th Doctor's sonic screwdriver to fix Professor Honeycutt's body. David Tennant plays both the 10th Doctor from Doctor Who and Professor Honeycutt.