Prisoners - S17.E17

Dillon hears Gem & Gemma humming a tune identical to the one from his pocket watch. They inform him that they learned it from a blind girl they befriended in a Venjix work camp, and that the tune came from a pocketwatch belonging to the girl's brother Dillon, convinced that his sister is still there, mounts a rescue attempt with the help of Summer and Ziggy while Scott and Flynn attempt to hold off a dangerous new attack bot. Dr. K and the Rangers learn that Venjix is building a doomsday weapon, and must venture back to the facility to destroy it.