The sinister truth behind Enthusiasm on Demand

Bart and Lisa finally locate their parents, Homer and Marge, at the "Enthusiasm on Demand" headquarters, only to find them acting strangely, wearing colanders on their heads, and seemingly brainwashed. They learn from the company's "Visionary" that the company's true purpose is to "harvest the time and energy of human beings for money," and that the mysterious "Enroy" refers to "Net Return On Investment." A rogue employee attempts to remove an "implant" from Homer, revealing a hidden device on his own head.