Stewie Griffin: The Untold Story is a 2005 direct-to-DVD animated comedy film set in the Family Guy fictional universe. Released on September 27, 2005, the film's main plot point concerns Stewie Griffin trying to find who he thinks is his real father after seeing the man on TV. He travels to San Francisco, only to find that the man is him from the future.

When the Griffins go swimming at the Quahog Community Pool, Peter tries teaching Stewie to swim and attempts to toss him into the pool, despite Stewie begging to be put down. Lois takes Stewie to swimming lessons, where Stewie meets Brad, a child about his age who is the "Star Swimmer." In jealousy, Stewie does everything he can to steal Brad's glory. As a last resort he tries to kill him by rigging a lifeguard chair with dynamite and luring Brad beneath it with marzipan; however, Stewie's detonator malfunctions, blowing up the legs of chair and causing it to fall on Stewie himself. He ends up in hell with Steve Allen. When Stewie is revived by Lois, he believes it is a sign for him to be a good boy.  After Peter learns that the new video store will not let him rent pornography, he vents his frustration in front of newscaster Tom Tucker, who gives him a job at Quahog 5 hosting a segment called "What Really Grinds My Gears," in which he rants about things that bother him. Peter becomes extremely popular, overshadowing Tucker, who is fired after attempting to distract Peter during filming.  Stewie attempts to be a good boy by smothering Brian with affection. Brian finally goads Stewie into reverting to his old, violent ways by crushing a spider web and eating the spider. Stewie starts drinking heavily, following Brian's way of coping. Brian attempts to cure Stewie of his alcoholism by taking him out for a night of drinking at the Drunken Clam. While drunk, Stewie crashes Brian's car through the wall of the bar. Knowing Stewie is Peter's son, Tom takes advantage of the situation and presents footage of the accident at the news station. Peter is fired and Tom is rehired as the anchor. The next morning, Stewie has a hangover and realizes his lonely existence in the world, wishing that there were someone else to whom he could relate. At the end Stewie says it is good that he stopped drinking now, so that it would not have any repercussions later in life.Answer this question using a quote from the following article:

What does he try to do to steal Brad's glory?
As a last resort he tries to kill him by rigging a lifeguard chair with dynamite and luring Brad beneath it with marzipan;