To help her mutant flower grow into the Thornox monster, Elsa uses a sample of mysterious green slime. Tommy seeks the same ooze from the source, and after a run in with some Tyranodrones, brings back some of it for Hayley to run a test on. She discovers that with it, she can demorph Tommy. The experiment is a success, but though he's no longer the Black Ranger, he's now invisible! Seems the slime kicked his Dino Gem power into overdrive, and until it wears off, he's clearly... well, clear. As for Thornox, he and the Evil White Ranger Clone team-up, and take on the Rangers' Thundersaurus & Mezodon Megazords. In personal life developments, Ethan's got his first date with Cassidy coming up, a picnic by the sea. He seeks assistance from his friends in making it go right: Kira helps with his fashion, Conner with his dancing skills, Trent with proper dining manners, and when things turn sour, the invisible Doctor O fixes the situation personally. T-Drones help to cut it all short. Ethan realizes he has nothing in common with Cassidy, and his duties as a Ranger would cut into a relationship with her. Similarly, Cassidy realizes her softening by knowing him is dulling the edge she needs to be a reporter, and her duties as a reporter preclude a relationship. They decide to remain friends. (thetvdb.com)