Deathgaron

A humanoid insect robot sent after Kotaro while Hitomi was kidnapped by Maribaron. RX uses him to enter the Desert of Death after Maribaron. As a result, Deathgaron is attacked by Triplon before he offers his services to Maribaron in return for redemption. However, Deathgaron is deceived and ends up being sealed up with RX as he kills off a replica of Hitomi placed there. This in turn causes RX to transform into RoboRider, breaking out of the sealed room and using his Voltic Shooter to heavily damage Deathgaron. Before he died from his injuries, Deathgaron revealed that Hitomi is still alive and with Maribaron. Episodes 14-15, Movie