Sideways is a Decepticon in the Transformers Movieverse. He has little screen time at the beginning of the film at Shanghai. Sideways is chased by his arch enemy, Sideswipe, and is killed while in his sleek sports car mode when Sideswipe slices him in half.
In Shanghai, Sideways is tasked with finding multiple communication arrays and then corrupting them, turning them in use of the Decepticons. Later, Starscream sends him to find the damaged Grindor and protect him until you reach the location where Soundwave can transport him back to Decepticon headquarters.