Tartarus was a robot that competed in the second Dutch series and the seventh UK series, having lost in round one both times. Martin Scholten, the builder of Tartarus, was unable to attend filming of Series 7 so Bryan Cutler, the captain of Reaper NP2, and Michael Hanser, the captain of Sniper who lost in the qualifiers, entered the robot in his place. The team jokingly claimed that Scholten was a top secret agent who was currently on a secret mission.