Eco Warrior was a robot that failed to qualify for Series 4. Work on Eco Warrior was started in August 1998 and the robot was originally intended to enter Series 3, but the team soon realised they would not be able to complete the robot in time, so decided to aim for Series 4 instead. It appeared to have car steering. Eco Warrior's team later joined forces with John Findlay of Team Roaming Robots to build T-Bone, which fought in Series 5. The team had met John Findlay at the Series 4 qualifiers, where his robot Banana-R Armour had failed to qualify.