Glaxxer Hambrath is Starlee Hambrath's younger brother and a very clumsy, mischievous boy. He appears in the episode Enter the Jammerhead, along with his and Starlee's parents.
While Cody Jones and Donatello are taking the Hambraths on a tour of O'Neil Tech, Glaxxer asks Cody if he is Starlee's boyfriend because his sister talks about her boyfriend all the time and he looks like the person she's described. While asking this embarrassing question, he manages to spill the drink he's set down on a control panel. As Cody kneels to clean up the mess, Glaxxer backs away and then slips in the spilled liquid, falling and hitting his head on the laser controls. Donatello dives to push the other Hambrath's out of the way.
Later, as Cody and Serling are preparing dinner, Glaxxer scolds them for not knowing how to make Omatranian mildew. Glaxxer then jumps on Cody, causing him to lose his balance and the bowl of salad he's carrying to fly into the air. Though Serling manages to grab both Cody and Glaxxer before they hit the floor, the bowl comes down on the robot's head. The bowl then bounces into the mildew, which is steaming on the stovetop, causing it to splatter Serling's face.
Throughout the episode, the klutzy Glaxxer continues to have mishaps. However, his penchant for trouble comes in handy later when Starlee uses her father's video camera to film Glaxxer having accidents and then uploads that video into Jammerhead's cerebral cortex. This overrides the martial arts chip jack that Jammerhead previously inserted into his head and causes the villain to trip, fall, and beat himself up.
At the end of the episode, the Hambrath parents hug Starlee after Mrs. Hambrath acknowledges that her daughter's new home is on Earth. Glaxxer rushes to join the group hug, and succeeds in knocking everyone over.