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Manacek is a detective from the 1970s. He makes his first appearance in "Homer Is Where the Art Isn't".
History
Manacek was called in after the painting The Poetess was stolen between being sold at Gavelby's Auction House and arriving at Megan Matheson's house. Chief Wiggum wasn't happy since he was being brought in rather than him being allowed to solve the case. Manacek then went to visit Megan Matheson and questioned her about it, finding out that she had insured the painting for double the cost. Manacek then flirted with Megan, telling her he could give her a "better workout".
Manacek then went to visit Mr. Burns, who was also a suspect in the case. Manacek found out that Burns couldn't stand being outbid by a woman, which hit a nerve with Burns. Mr. Burns then told Manacek that Homer took the painting, so Manacek went to visit Homer at the Nuclear Power Plant.
Manacek revealing that Megan Matheson is the thief
At the Power Plant, Manacek revealed that he knew Homer was obsessed with the painting, which he found out from Lenny. Homer told Manacek that he was obsessed with the painting and he would do anything to have it. Manacek thought there was more to Homer's story and he was going to figure it out. That night, Marge visited Manacek to try and convince Manacek that Homer was innocent. Manacek told Marge that she could convince him over dinner, so Marge brought him to her house to have dinner with the family, which annoyed Manacek.
Marge told Manacek that Homer was quick to panic, which is why he was cowering away from Manacek. When Manacek was hitting on Marge, Bart and Lisa told him to back off. Bart then told Manacek the story of how Homer became obsessed with the painting. Marge told Manacek that Homer just couldn't stop thinking about the painting. Manacek thought there was issues with the story as Homer didn't seem like the kind of person who would be interested in art.
Whilst the family were telling Manacek the story, Homer fled from the house. Manacek then told Marge that once he sent Homer to prison, she'd be "kind of single". After Marge told Manacek that Homer could not have stolen the painting, Manacek figured out who the thief was. He then went to the Springfield Museum of Fine Arts where he knew Homer would be. He told Homer that he knew he was innocent as Homer was too dumb to steal the painting. Manacek then assembled all the suspects and interested parties to the museum where he revealed to everyone that Megan Matheson stole the painting. He knocked out Megan after she pulled a gun on him and then revealed that this was actually a fake painting, as Mr. Burns had stolen the real painting. He then knocked Burns out after he pulled a gun on him.
Manacek then found the painting at Burns Manor, only to reveal that it was also a fake, it was actually Lisa's gift shop tote bag. Lisa then gave the painting back after Manacek told everyone that it went back to the city. At the Springfield Arena Football Arena, Manacek asked Marge if he would have a shot if things were different and Marge slapped him.
At some point after all this, Manacek filed his invoice for $1,500,000 with the city. He also hung out with Bart for a bit, had a wrestling match with Cletus, helped arrest Professor Frink, had a date with Miss Hoover, attended a Sex Addicts Anonymous session, won an award for Polish-American Man of the Year, visited a salon with Agnes Skinner and an old lady, got handed a baby that looked like him by a woman, had a fencing match with Sideshow Mel and attended a DJ concert with Homer Simpson and DJ Daddy Towers.
