"Weird Al" Yankovic joins the show.
Scott makes a deal with the devil to land Ken Marino as a guest; and a singer from Iceland performs her country's new national anthem.
Scott and guest Judd Apatow recall Reggie's final show when a reporter visits to investigate what happened to the musician.
Amy Poehler joins the show.
A sleepy Zach Galifianakis tries napping on the couch; Reggie dreams of playing with Tears for Fears; and Scott attempts to keep cast and crew awake.
Jon Hamm joins the show.
Scott travels back into the 1960s in an effort to change the path of Reggie's history; and a plate-spinning novelty act has a secret.
Musician Wayne Coyne shows up for Halloween in costume and hangs out with a ghost of Scott's previous career and the show's accountant.
Steven Yeun, star of "The Walking Dead," discusses how he would handle a zombie invasion; a community activist promotes his programs; and a documentarian who has been filming Reggie's life stops by.
Skateboarder Tony Hawk offers advice to two crew members.
Scott is mesmerized by Nick Offerman's mustache.
In the Season 3 premiere, Scott and Patton Oswalt are up for the same acting part; a turtle expert snaps; Reggie's real name is revealed; and unsuspecting bystanders are observed when confronted with an unprotected laptop.
Elizabeth Banks joins the show.
Scott gets a new partner in Kid Cudi, and the two need to clear the air and work as a team, while Michael Cera shows up and shows off his business cards. Also, German pretzel maker August Lindt offers unusual vacation-destination recommendations.
With the regular crew on vacation, Scott and Kid Cudi are left to finish the season with subpar replacements. Meanwhile, Brie Larson plays "What's in Her Bag?" and orphan boy Fourvel offers tips on beating the summer heat.
An interview with Colin Hanks is in jeopardy after a physicist takes the crew aboard his spaceship and there's a problem.
Thomas Middleditch provides examples of his excellence at accents; Scott's secret identity is in jeopardy when friends win one of the show's contests; and Harmony Moonglass leads a meditation session.
Eric Andre drops by, while Scott attempts to pull off the perfect episode with help from a scientist's invention.
Jenna Fischer offers a clip of her appearance on a British version of the show.
Rapper Lil Jon discusses his retirement plans; and the spokeswoman for a new hair-extension line presents Scott with one of their products. Meanwhile, Scott and Reggie must solve the Quizzler's quizzles.
Chris Hardwick is introduced to the show's new secretary as she climbs the ladder of success; Reggie is featured in a new commercial; and the aspiring Honorary Mayor of Hollywood visits.
Dane Cook shares the couch the cast of a critically acclaimed TV series; Scott introduces a brand-new character; and Reggie is observed doing what he does offstage.
Scott gets a lesson in making prank phone calls from rapper Kid Cudi; and a 6-year-old movie critic talks about his favorite films. Meanwhile, a brokenhearted Reggie goes looking for love as a contestant on Scott's new dating show.
Joel McHale discusses having a strange birth and a Hollywood actor opens up about his recent firing. Meanwhile, the show begins operating under Scott's new high-tech Comedy Touch Touch 1000.
Director Kevin Smith helps celebrate Scott's birthday, as Reggie goes the extra mile to make the episode memorable. Meanwhile, an obnoxious college student offers a new take on "charity work."
Dax Shepard offers his take on the difference between comedic and dramatic acting. Also, a professional gift-guesser does his thing; and Scott and Reggie's rent increase leads them to seek a new roommate.
Maya Rudolph is game for Skirmish of the Sexes, while Scott goes undercover to bag a bank-robbing Reggie.
Skylar Astin confesses to his real age; Scott hires a tutor to help him pass an important test and keep his job; and DJ Forsythia reads listener dedications.
Scott and Fred Armisen are in the running to host a late-night talk show.
An inquiring Craig Robinson drops by; Reggie heads into space to battle aliens; Scott turns home renovator; and a comedy team keep a lethal secret.
Tom Lennon demonstrates how very messy he can get, while Scott's editors go on strike, so he shoots the show in one take to air as is. Also, a Broadway director spotlights songs from his hit show.
Scott offers to help a wizard save his realm if he agrees to perform a magic act with the host. Meanwhile, James Marsden acts with a rabbit and discusses his handsome appearance; Mr. Celebrity dishes Hollywood gossip; and Scott and Cudi preview their zombie film.
Lizzy Caplan visits and poses a very interesting question.
Scott has to hire a replacement security guard after he fires Zeke; Carly Rae Jepsen premieres a song; and an amusement-park owner sings the praises of his scary new ride.
Karen Gillan dishes on film secrets, and a small-business owner opens up about his unsavory profession. Meanwhile, Scott likes his new writers, but still shows a penchant for old-school comedy.
In the Season 4 finale, Weird Al Yankovic plays a game of "Celebrity Weird Al Do's," while the show makes an attempt to appeal to female viewers by hiring three cohosts.
Kathryn Hahn swears a lot; John Lennon may have returned from the dead; and Scott teaches skills necessary to be a talk-show host.
Robert Kirkman reveals his greatest fears, while a famous actor promotes his latest film. Also, Scott and his crew turn the set into a Halloween haunted house.
Stephen Merchant talks about his rock collection; a martial artist demonstrates karate skills; Scott discovers a secret about his parentage and goes through some life-threatening challenges against formidable foes.
Randall Park plays a game of "Title These Tunes," while Scott considers wearing an unusual hat to a ceremony honoring him with a Lifetime Achievement Award. Also, an author demonstrates his process for writing more than 140 novels.
Ed Helms joins the show.
Scott gets a lesson in the birds and the bees from Michael Sheen, while entertainer Victor Diamond offers a breakdown of his many medical maladies. Later, Scott saves the world's weirdest cat.
Amber Tamblyn celebrates Thanksgiving with the gang; and Reggie invites his favorite comedians to dinner and gets more than he bargained for.
A postaccident Zach Galifianakis visits.
Adam Scott joins the show.
Scott discovers he has feelings for his producer; Joseph Gordon-Levitt recruits Reggie for his production company; and a shock jock dishes truths about Taco Tuesday.
A$AP Rocky shows off his awards, while Scott unveils the trailer to his sports movie, and also watches as some of his personal paraphernalia comes to life.
Uzo Aduba performs stand-up; Tim Landers plots retaliation against some bothersome kids; and futuristic versions of Scott and Cudi time travel back to the present to rescue comedy.
Michelle Monaghan demonstrates her hog-wrestling skills; and Alan Thicke sings personalized theme songs for the gang. Meanwhile, the suddenly wealthy Scott is visited by a long-lost brother.
Adam Pally discusses his holiday plans; Scott's new dating show makes its debut; and Kid Cudi introduces his new character.
Josh Groban does his singing thing; and global warming has turned the show's Christmas set into a beach.
Mary Elizabeth Winstead celebrates a birthday; and, with a health inspection coming up, Scott and Cudi try to catch a rat in the studio. Meanwhile, an inventor demonstrates a new gadget.
Shoppers take drastic measures to ensure getting a popular Christmas toy; and the Lonely Island get everyone in the holiday spirit.
Scott hopes to make a good first impression on his dream girl, Ellie Kemper, and later, he sets out to repair a run-down school.
Scott and Mark Duplass have a shoot-out; Miss Polite offers etiquette advice; Scott plays Cupid for Reggie and his dream girl.
Simon Helberg sets out to prove he is not an android; author Shiloh Huffington attempts to scheme his way onto the couch; and a drill sergeant whips Scott and Reggie into shape and sends them on a dangerous mission.
In the Season 4 premiere, Ty Burrell stops by and craft-services worker Fabrice Fabrice performs spoken-word poetry.
Rob Corddry visits; and a poet stops in.
Jesse Tyler Ferguson discusses the chemistry of the "Modern Family" cast; a cyborg-rights activist proffers opinions about the future; and Scott seeks balance between his family life and his career as a talk-show host.
Scott and Reggie put a dent in the show's stunt budget; Jack Black contemplates whether to play a well-known song on the show; and vigilante J.W. Stillwater discusses fanboats and alligators.
Alison Brie reveals her acting secrets, while a German director discusses plans for his next film.
Judy Greer shows her universal audition, while the gang anticipates an appearance by Tom Hanks. Also, it is learned that Kid Cudi is a former hockey star, and an old rival stops by the studio to challenge him to a rematch.
Zach Galifianakis joins the show.
Former NFL running back Eddie George recalls his greatest plays; football commissioner Wendell Gazell discusses upcoming changes to the game; pranksters Scott and Reggie are forced to trade theme songs with the sports-talk show next door.
Scott raps with rapper Schoolboy Q; Aaron Neville promotes his anti-violence campaign; Reggie has two warring musical combos seeking his attention.