Robot Wars was a British game show modelled on a US-based competition of the same name. It was broadcast on BBC Two from 1998 until 2003, with its final series broadcast on Channel 5 in 2003 and 2004. Additional series were filmed for specific sectors of the global market, including two series of Robot Wars Extreme Warriors with U.S. competitors for the TNN network, and two of Dutch Robot Wars for distribution in the Netherlands. The fourth series of the UK Robot Wars was brought to the United States on TNN as Robot Wars: Grand Champions in 2002, and hosted by Joanie Laurer. In 2003, the roboteers themselves formed The Fighting Robot Association and with their associated event organisers, carry on participating in competitions for new audiences. The series involved teams of amateur and professional roboteers who made their own robots to fight against each other in both friendly and tournament matches. As well as fighting each other, they had to avoid the "House Robots", which were not bound by the same weight or weapon limits as the contestants. Robot Wars had peak audiences of 4 million, and was commercially successful in its merchandising.