Arachbot kidnapped Tails in the Green Hill Zone and dragged him underground into the Labyrinth Zone. On Doctor Robotnik's orders, Arachbot intended to turn Tails into a badnik by re-inserting him into his old Robofox exo-skeleton, although Arachbot claimed that he would prefer to simply kill Tails. Unfortunately for Arachbot, Sonic the Hedgehog and his friends had followed him, and Sonic covered the robot in oil and set it alight.
Some time after that, a new Arachbot was built by Robotnik during The Battle For Mobius. The Badnik invaded the Turquoise Hill Zone but, while it successfully beat up Tufftee, it was taken down by Joe Sushi, Tux, and Flicky.
- Arachbot at Sonic News Network, the Sonic Wiki