Mastiff faced UK Champions Chaos 2, US robot Manta and German robot Ansgar in its only battle, which was also broadcast as part of German Robot Wars. It was immediately targeted by Chaos 2 and was flipped over several times, however no damage was caused internally. The pit was activated and Chaos 2 pushed Mastiff near the edge. However Chaos 2 tried to flip Mastiff into the pit, but only flipped it away and drove itself down instead. Mastiff didn't have time to recover as it was quickly pushed down the pit by Manta, going out of the World Championship.