Ep 1. Bonnie & Neddy

In the first episode of season 9 of Adventure Time with Finn and Jake, titled "Bonnie & Neddy," Finn and Jake venture to the Candy Kingdom to find Princess Bubblegum's missing younger brother, Neddy. When they arrive, they are shocked to discover that Neddy has transformed into a giant worm-like creature that has burrowed deep beneath the Candy Kingdom.

As Finn and Jake search for Neddy, they run into Princess Bubblegum's sister, Bonnie, aka "Ruler of the Nightosphere." Bonnie reveals to Finn and Jake that Neddy's transformation was caused by a traumatic event from his past, but she refuses to elaborate further.

As Finn and Jake continue their search, they encounter a number of obstacles, including a malfunctioning elevator and a group of candy people who have been mutated by Neddy's presence. Meanwhile, Bonnie struggles to come to terms with her own past, which has also been linked to Neddy's transformation.

Ultimately, Finn and Jake are able to locate Neddy and find a way to return him to his original form. Along the way, they learn important lessons about family, forgiveness, and the power of facing one's fears.

"Bonnie & Neddy" is a heartwarming and exciting episode that showcases the show's signature mix of humor, adventure, and emotional depth. Fans of the series will love seeing their favorite characters in action once again, while newcomers will be drawn in by the episode's captivating storyline and imaginative world-building.