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Writer Dan Harmon has his assistant Spencer Crittenden construct a time machine to transport historical figures from the past so he can interview them. The interviewees only survive for a few hours before undergoing a "total protoplasmic disconversion" and collapsing into dust, which Spencer collects in a jar.
Given a hearing aid, Beethoven hears some of his most famous compositions for the first time.
Dan attempts to bond with Hemingway over their common interests in drinking and writing, but is intimidated by his masculinity.
Unsatisfied with the quality of his phonograph recording, Edison insists on recording a new version in a modern studio.
Mary's arrival gives Dan a chance to express his feminism, but he is irritated by Mary's stern demeanor. Meanwhile, it is Spencer's birthday.
Shakespeare is unimpressed by Community, preferring the bawdy comedy film Dirty Grandpa.
Amin's arrival fulfills Dan's desire for ethnic diversity, until he takes the office hostage.
Betsy's racism discomforts Dan until they broach the subject of Bernie Sanders.
Amelia is disappointed with her legacy of getting lost, and sets out to prove that she is indeed still alive.
Freud arrives just in time, as Spencer refuses to use catchphrases written for him by Dan.
Poe undermines Dan's need to impress a History Channel executive, who falls for Poe. Dan and Spencer attempt to influence their date to secure an additional run of episodes.
The Buddha participates in a series of product placements, making Dan feel guilty.
Booth emphasizes his skills as an actor rather than his notoriety as the assassin of Abraham Lincoln.
After they bond over their shared love of coding, Ada convinces Spencer to convert his body to code and join her in virtual reality.
Kennedy is accidentally transported along with a spider, creating an additional half-Kennedy-half-spider being which cocoons the crew.
Dan takes Truman to a gay bar to teach him about gay rights and desperately pander to LGBT critics.
