As Halloween approaches, Lorne throws a Halloween party for all the firm’s clients and employees and even gets a reluctant Angel to invite a powerful demon lord, named Archduke Sebassis, to the party. During the gathering, Lorne's timely advice to his friends starts happening literally, leading to Fred and Wesley getting drunk after Lorne tells them to loosen up, Gunn to embarrassingly relieve himself to "stake out his territory", Angel and Eve to have sex, and even Spike and the dim-witted Harmony to have fun on the dance floor. The events lead to only more trouble when Lorne's empathic subconscious begins manifesting itself in a hulking demon (resembling a larger Lorne on steroids). The demon appeared as a result of Lorne's sleep deprivation after Lorne had Wolfram and Hart remove his sleep: an empath with long-term sleeplessness can write people's destinies instead of just reading them, and the empath's subconscious can physically manifest. The episode also reveals that Lorne is proud of his organizational skills, as he feels most of his other talents simply do not match up to what his friends can do.
The larger Lorne causes much violence before the gang restores Lorne's sleep, thus neutralizing the monster. The chaos and destruction has a positive side: the rank and file of Wolfram and Hart express the opinion that it greatly improved the party.
Several employees make comments about the previous year's party even though Lilah stated in "Calvary" that The Beast killed everyone who worked at Wolfram & Hart: lawyers, janitors, secretaries, people out sick that day, etc. Were that the case, then no one would know anything about the previous party because all of the people who attended the previous party are dead.