In the end, Glassboy helped save the day when he lured Larvo back to his cave before getting knocked out by the blast from Bubblegum's force-field getting turned to full-blast. In response, Glassboy wrote an angry song ' See Through' which he preformed for Marceline. He fell out with See-Thru Princess after the pressure from the other citizens made her lash out and ask him to get out of her face. He travelled back to the Glass Kingdom with Marceline and Princess Bubblegum but once they arrived Marceline's song was unable to defeat Larvo again.
The song got his attention as it contained Marceline's name in the lyrics and Simon eventually brought Glassboy to Marceline, who agreed to help after he begged her. After traveling for long he found himself in the Candy Kingdom where he stumbled upon Simon who was performing the song ' Remember You' at an open mic. He was imprisoned in the jail tower but was freed by See-Thru Princess so he could find Marceline who was believed to be the only one who can stop Larvo. In hopes of healing his crack, Glassboy snuck into Larvo's chamber but accidentally woke him. This made everyone in the Glass Kingdom bully him - with the exception of See-Thru Princess, who was his only friend. At some point in time, Glassboy gained a crack on his forehead.
