Staying true to the premise of the original series: Lion-O and the ThunderCats — Tygra, Panthro, Cheetara, Wilykat and Wilykit — barely escape the sudden destruction of their home world, Thundera, only to crash land on the mysterious and exotic planet of Third Earth. Lion-O, the newly appointed Lord of the ThunderCats, attempts to lead the team as they make this planet their new home. A bizarre host of creatures and villains stand in their way, including the evil Mumm-Ra, Third Earth’s wicked ruler who will let nothing, including the ThunderCats, stop his tyrannical reign over the planet.
The series was first revealed in a trailer in May 2018 and was met with immediate backlash. The trailer has been hated by many fans of both the original series and the 2011 reboot. The series has been criticized for its art style, characters' utter stupidity, villains' extremely-creepy designs and comedic tone, drawing unfavourable comparisons to Teen Titans Go! and OK K.O.! Let's Be Heroes.
Main article: Thundercats Roar/Episodes
The first season of the series premiered with the two-part special "Exodus" on January 10, 2020 on the CN app, it made its television debut on February 22, 2020. The season is currently ongoing.
On March 13, 2020, an episode of Teen Titans Go! was released online, it featured a crossover between the Titans and Thundercats Roar. In it, the Titans are outraged when their favorite cartoon is rebooted so they come up with a plan to get this new show off the air. The episode is a commentary on the outrage that Thundercats Roar received when the show was first announced in 2018. It received a negative reaction from critics online. The episode made its television debut on April 4, 2020.
- The producer of the series, Victor Courtright, was the creator of the "Get'em Tommy" Digital Series on Cartoon Network's YouTube Channel.