Ep 3. Guitar of Rock / Return of Mordecai and the Rigbys

Mordecai and Rigby's rock band, Mordecai and the Rigbys, reunites in "Guitar of Rock/Return of Mordecai and the Rigbys," the third episode of Regular Show's eighth season. The episode begins with the band's former guitarist, CJ, paying a visit to the park and telling Mordecai about an upcoming battle of the bands competition. Despite Mordecai's initial reluctance, CJ convinces him to participate, and the two begin to prepare for the competition together.

As they rehearse, they discover that they're missing one crucial instrument: the titular Guitar of Rock, which is said to have a magical power. They soon learn that the guitar is in the possession of the band's former manager, Gene, who has become a washed-up, bitter recluse. Mordecai and CJ set out to retrieve the guitar, but they're not the only ones after it; they're forced to compete against various rival bands, including one led by Gene himself.

While Mordecai and CJ battle for the mystical guitar, Rigby becomes consumed with the idea of reuniting Mordecai and the Rigbys. He enlists the help of Muscle Man, Hi-Five Ghost, and Skips to convince the former band members to put aside their differences and come together once more. But when they do agree to reunite, Rigby realizes that there's one problem: they're missing a crucial member.

Meanwhile, Mordecai and CJ finally retrieve the Guitar of Rock and use its powers to win the battle of the bands. But despite their success, Mordecai starts to feel guilty about the way he treated his former bandmates. After running into Rigby, who is determined to bring the band back together, Mordecai decides to set things right. He convinces several of the former members to reunite, and together, they perform the ultimate reunion concert.

"Guitar of Rock/Return of Mordecai and the Rigbys" is a classic Regular Show episode, filled with the show's trademark mix of surreal humor and heartfelt character moments. Fans of the show will love seeing the return of beloved characters like CJ, Gene, and the members of Mordecai and the Rigbys, and the episode is sure to satisfy anyone looking for a fun, high-energy adventure.