Last But Not Beast is the 39th and final episode in season 2 of Dexter's Laboratory, which aired on June 15, 1998. The episode features Dexter in Japan as part of an exchange student program. While there, he unleashes Badaxtra, a giant monster with an ax for a head, upon the city, causing chaos. With the aid of his family, The Justice Friends, and the cast of Dial M for Monkey, Dexter battles Badaxtra in order to save Japan.
Dexter's family is in a huge rush and Mom goes to wake up a boy named Toshi who is a student from Japan. Dexter is back in Japan where he uses his giant robot to battle other robots of other kids. When he does the teacher scolds them for it and Dexter accidentally shoots some rockets into a volcano awakening a beast called Badaxtra. The Kids and Teacher exit the scene, and Dexter does the same after He barely escaped being crushed, as Badaxtra continues to terrorize the town.
At what seems to be New York, Agent Honeydew, along with Global Security fight off Badaxtra, but They failed. Honeydew tells the Commander that Her squadron failed. the Commander informs The Justice Friends of the Badaxtra threat. and when the Justice Friends take on Badaxtra, Capital G goes to fight at maximum size, but made only half of Badaxtra's height, as Badaxtra flicks Him offscreen. Tiki Torch goes to battle and attempts to give Badaxtra the Honululu Hotfoot, (which gets Himself under Badaxtra's foot and torching Himself) Unfortunately, Badaxtra spits on the Tiki-Based Hero, which disgusts the other heroes. Valhallen tries His luck and plays His Ax at a high volume, which is working against the Monster (along with the other Justice Friends and the citizens) but His plan was put to a halt when four fanatics pounce on the Rocker. The Infragible Krunk with a roar tosses Badaxtra into the sky. as Major Glory commends Krunk for His part, Badaxtra falls back down to earth, crushing the remaining Justice Friends. the Commander who saw the battle goes into the fray, with only missiles. However, Badaxtra turns off the Commander's screen, which falls in front of Honeydew, Who summons Monkey via telepathy. Just as Dexter goes back home to his lab and has to team up with Dee Dee, Toshi, and his Mom and Dad to fight Badaxtra, even if it means telling His parents about His secret laboratory.
As Monkey, too, falls to Badaxtra, Dexter's parents decide to help and They tell Him that They'll have a long talk about the laboratory, because now they have to fight Badaxtra. It is hopeless when they do, and then Mandark steps in and tries to fight him, but he only makes him stronger. Then, Toshi tells them a way to defeat the monster with the power of love. Then, Monkey adds his power to fight Badaxtra and they win. After that, Dexter finds out Monkey's secret identity, and his Mom and Dad decide to have a talk with him about his lab. Dexter brainwashes them to make them forget, then Monkey brainwashes Dexter to make him forget about his identity. Mandark acts like he defeated Badaxtra and Dexter feels sad about that because he thinks its real. Dee-Dee is the only one in the family who remembers the epic battle and just gives a big happy wave goodbye and the episode ends.
This episode was supposed to be the series finale leading up to Ego Trip. However Dexter's Laboratory was later renewed for another season without Tartakovsky's involvemment.
Badaxtra is a nod of Godzilla and Gamera.
This episode is a reference of anime's such as Voltron, Gundam, Toksatsu franchises such as the Super Sentai & Power Rangers, and kaiju films like Godzilla, and also mocks the Battle of Hoth Snowspeeders vs. AT-AT walkers from Star Wars Episode V: The Empire Strikes Back.
This episode is the series' first and only full episode-length story.
The title is a play on the phrase, "last but not least," indicating this was intended to be the series finale, until the series returned from hiatus in 2001 for a third season.
Despite the fact Dexter was supposed to have been in Japan at the time, his parents act as if this was not the case when he attempts to recruit them to pilot his machine.
The Music in the episode "Go Dexter Family Go" which parodies the theme song for Mighty Morphin Power Rangers "Go, Go, Power Rangers" was reused in a future episode which shares the same name as the episode.