the first series of Robot Wars had largely featured passive weapons, the second series saw a greater number of robots—including the series champion, Panic Attack—using lifting and flipping weapons designed to overturn an opponent. Lewis and Scott noted that when Razer was overturned with its piercing arm fully upright, the robot was more than halfway towards naturally rolling back onto its wheels. Therefore, rather than equipping Razer with a powered mechanism for righting itself when inverted, two wings were attached to the arm. Tensioned via cables, the wings opened when the arm was fully raised, levering Razer back onto its wheels. The unique design provided Razer with a "victory salute"—raising its claw and wings whilst standing on its tail—but had the downside of putting the machine over the weight limit of . To redress the balance, approximately 450 holes were drilled in the robot's metalwork. From series five of Robot Wars onwards, the weight limit for heavyweight competitors was increased to . This allowed for improvements to the chassis and bodywork of Razer including new titanium outriggers, and thick armour panels versus before. The most noticeable alteration to this version of Razer was a redesigned front scoop. This enclosed the front wheels to reduce side-on impact damage, and greatly decreased the robot's ground clearance to reduce its vulnerability to being flipped, whilst also making it easier to get underneath opponents to crush them. This iteration of Razer won the first Robot Wars Extreme All-Stars championship and series five of Robot Wars, alongside mounting a successful defence of its World Champion title. By the time of Razer's Robot Wars Extreme II appearances, the machine weighed , was long, and reached a top speed of . Combat history Series 2–4 and BattleBots Razer made its debut in the fourth heat of series two of Robot Wars, which was viewed by almost six million people on BBC Two. It had been finished late the night before the recording. Radio interference caused Razer to be hard to control in the Gauntlet stage of the competition, but it successfully navigated the obstacle course and progressed to the Trial. This phase was a robotic football match, wherein Razer scored the first goal to reach the heat semi-final. Its opponent for this one-on-one battle was Inquisitor, a box-shaped robot equipped with a rotating flail. Whilst Razer made the stronger start, crumpling Inquisitor's flail support, the cush drives