Everybody in the Universe and Yivo live together happily, except for a skeptical Leela. Bender misses the humans.
When Leela loses her cool over some redneck bullies, Farnsworth orders her to wear an electrical collar to help control her temper; and Bender loses his mind over Dungeons and Dragons.
When doctors can't get through to Bender, they order a robotomy.
While Bender is getting a robotomy, Farnsworth, Leela, and Fry wind up with Bender in his imaginary world of Dungeons and Dragons.
When Farnsworth and the gang reach Momon's Lair, an all-out battle ensues over the anti-crystal.