In the 2011 Animated Series, Ratar-O is the dictator of the Rats, a descendant of Ratilla who found the Sword of Plun-Darr after the Animals ended up on Third Earth. While under Mumm-Ra's services, the Rats served as janitors within the Black Pyramid before ending up scavengers on Third Earth. Though Ratilla used the item to turn his people into a power equal to the Thundercats, the Sword of Plun-Darr corrupted his mind before Jaga is forced to kill him in order to seal the weapon away in what becomes Mount Plun-Darr. As the weapon's whereabouts are unknown to Mumm-Ra, Ratar-O buys the Thunderian survivors from the Lizards to use as slaves to mine for the Sword of Plun-Darr and obtain it for him due to the curse Jaga placed on it that kills any who attempt to retrieve it. When the Thundercats raid Mount Plun-Darr as Tygra and Cheetara pose as slaves to get the sword, Lion-O's group are captured by Mordax and turned over to Ratar-O. But once Tygra and Cheetara found the Sword of Plun-Darr, it caused much of Mount Plun-Darr to collapse with Ratar-O's palace destroyed in the process. Following the castle collapse, Ratar-O battles Lion-O who manages to defeat Ratar-O as he retreats underground.