The Great Louse Detective

The Simpsons win a free spa weekend. At the spa, Homer is nearly killed when a mysterious person locks him into an incredibly hot steam room with a spanner, but he is saved when Krusty the Clown unlocks the door. This prompts Homer and Marge to see Chief Wiggum, who suggests that they seek help from someone who can understand a murderer's twisted mind – Sideshow Bob, who is released from prison, much to Bart's discomfort. To ensure Bart's safety, Wiggum places a shock bracelet on Sideshow Bob's ankle to keep his murderous urges at bay when he comes to live at the Simpson house. Bob asks Homer to list all the people who may want him dead, and follows him around to investigate who the mystery assailant could be. During their day, they end up at a repair shop, where Homer chastises the mechanic, Junior.

Homer and Bob go to Moe's Tavern, where the assailant fires at Homer with a gun, before escaping in a tow truck. Bob suggests that Homer should stay home and out of sight to be safe, but the latter is named the King of the Springfield Mardi Gras, in which he must ride on a float for the whole day. Bob discovers that Homer won because someone rigged the ballot in his favour, but Homer takes part in the parade anyway in hopes of luring out his attempted killer. At the parade, Bob learns that a brake line on Homer's float has been cut, and draws a correlation between the wrench used to lock Homer in the steam room, the wrenches in the tow truck and a smudge on the spa invitation, realizing that Junior is the killer. As the float goes out of control, Bob saves Homer by getting fired out of a cannon and grabbing Homer with his huge feet from above, just before the float crashes into the Museum of Swordfish.

Homer and Bob end up giving chase to the killer, who is revealed to be Frank Grimes Jr., the illegitimate son of Frank Grimes, who blames Homer for his father's death. Junior attempts to kill Homer, but is foiled when the police arrive. That night, after Homer puts Bart in bed, Bob takes possession of the remote for his shock bracelet and sneaks into Bart's room, intending to kill him. However, Bob realizes he is accustomed to Bart's face and cannot bring himself to do it. He tries to take his leave, but gets zapped continuously by his shock bracelet (because of birds pecking the remote after it landed in their nest).

Kelsey Grammer voiced Sideshow Bob in the episode, as he had several times prior to this.

"The Great Louse Detective" was written by John Frink and Don Payne and directed by Steven Dean Moore as part of the fourteenth season of The Simpsons (2002–03).[1] American actor Kelsey Grammer guest starred in the episode, returning to voice the recurring character Sideshow Bob.[2][3] Since season three's "Black Widower" (1992), the writers have echoed the premise of Wile E. Coyote chasing the Road Runner from the 1949–1966 Looney Tunes cartoons by having Bob unexpectedly insert himself into Bart's life and attempt to kill him. Executive producer Al Jean has compared Bob's character to that of Wile E. Coyote, noting that both are intelligent, yet always foiled by what they perceive as an inferior intellect.[4]

This is one of the first episodes of The Simpsons that were animated with digital ink and paint, and marked the series' permanent switch to that technique. Previously, episodes had been animated using the traditional ink-and-paint process. Digital ink and paint had previously been used by the animators of The Simpsons for season 7's "Radioactive Man" and season 12's "Tennis the Menace", primarily to test the technique.[5]

The episode originally aired on the Fox network in the United States on December 15, 2002.[1] It was viewed in approximately 8.75 million households that night. With a Nielsen rating of 8.2, the episode finished 23rd in the ratings for the week of December 9–15, 2002. It was the highest-rated broadcast on Fox that week, beating shows such as King of the Hill, Malcolm in the Middle, 24, That '70s Show, and the 2002 Billboard Music Awards.[6] On December 6, 2011, "The Great Louse Detective" was released on Blu-ray and DVD as part of the box set The Simpsons – The Complete Fourteenth Season.[7] Staff members Matt Groening, Al Jean, John Frink, Ian Maxtone-Graham, Matt Selman, Tim Long, Michael Price, Tom Gammill, Steven Dean Moore, Mike B. Anderson, and David Silverman, as well as cast member Dan Castellaneta, participated in the DVD audio commentary for the episode. Deleted scenes from the episode were also included in the box set.[8]

The episode has received generally positive reviews from critics. In 2009,

IGN's Leo Waldbaum listed "The Great Louse Detective" at number seven on his list of the "Top 10 Sideshow Bob Episodes". At that time, ten episodes revolving around the character had aired. Canning wrote that the episode "was a lot of fun as it put Bob in an unexpected situation with the Simpsons, interacting more with Homer than with Bart." He added that the episode "is also memorable for having Homer's attempted murderer turn out to be Frank Grimes Jr., son of Frank 'Grimey' Grimes. This was a nice reference to 'Homer's Enemy' and was a rare instance where the series carried through some continuity."[9]

DVD Movie Guide's Colin Jacobson commented that "Over the years, we’ve gotten many a great Sideshow Bob episode, so this one has to live up to steep competition. While not a bad show, 'Louse' fails to live up to its predecessors. It does throw out some good moments, and it’s fine by Season 14 standards, but it doesn’t qualify as a Sideshow Bob classic."[8]

Wikiquote has quotations related to: "The Great Louse Detective"

• "The Great Louse Detective" at The Simpsons.com
• "The Great Louse Detective" at IMDb
• "The Great Louse Detective" at TV.com