Dan is visited by Ludwig Van Beethoven (Jack Black), who shares the lyrics to his most famous compositions.

Dan is visited by a clone of Ernest Hemingway, who tries to make him into more of a virile man.

When Shakespeare materializes in the lab, Dan is excited to show The Bard Community. Shakespeare turns out to have different tastes.

Spencer brings a person of color to the present, which overjoys Dan. At first.

Betsy Ross struggles to find her place when she discovers she's famous for simply sewing the American flag.

The Buddha embraces his role as product spokesperson to help keep the show afloat.

Ada is brought back to present day to discuss her role in its development.

Since the episodes air non-consecutively, this is the last episode canonically. Spencer and Dan fly to LA in hopes for a second season but realize they're canceled. To fill their episode order, they get JFK. Wow.

Dan Harmons guest from the past is Harry S. Truman (Matt Walsh). Dan takes Truman to a gay bar to teach him a lesson on gay rights.