Throughout the series, house robots acted as obstacles to competing robots in battles and challenges. House robots were permitted to attack robots that were in the Corner Patrol Zones at the corners of the arena or upon the submission of a competing robot. The house robots were an intrinsic part of the programme's success and merchandising of these robots was highly successful. Furthermore, the house robots were not subject to the weight limit or weapon rules that contestant robots had to adhere to, the most notable example of this was Sergeant Bash's flamethrower.