Thundera is the former home planet of the ThunderCats in the 2020 series, ThunderCats Roar.
It is described as being quite beautiful, peaceful and harmonious by the ghost of Jaga during his narration. It explodes shortly after appearing because, according to Jaga, "Everything splode some day." and the ThunderCats are the only ones to escape.
- Unlike the 1985 series version, Jaga was suggested to have perished with the planet. In the 1985 series, he died while piloting the Royal Flagship to Third Earth after escaping the destruction of Thundera.