Tax and Fax are 2 aliens who have been living among us for some time. They have been learning and using their knowledge to control a human-shaped robot without anyone noticing. But there's a problem: they can't be awake at the same time and they need to collaborate to keep the robot running.

Tax, the orange alien, is the brains of the team. He is responsible for evaluating the terrain and sending instructions to Fax.

Fax, the green alien, is the executing force. He is not very intelligent but he blindly trusts Fax. It always executes the instructions as it found them, that is, in reverse order...