NSFW: Disturbingly Funny, Scientifically Accurate THUNDERCATS

ThunderCats follows the adventures a group of cat-like humanoid aliens called Thunderians, from an alien planet called Thundera. The dying planet Thundera is meeting its end, forcing the ThunderCats to flee their homeworld. The fleet is attacked by the Thunderians' enemies, the Mutants of Plun-Darr, who destroy most of the starships fleet, but spare the flagship, hoping to capture the legendary mystic Sword of Omens they believe is on board. The sword holds the Eye of Thundera, the source of the ThunderCats's power, which is embedded in the hilt. Though the Mutants damage the flagship, the power of the Eye drives them back. The damage to the ship means the journey to their original destination is not possible, instead having to journey to "Third Earth;" which will take much longer than they had anticipated. The eldest of the ThunderCats, Jaga, volunteers to pilot the ship while the others sleep in capsules. He himself dies of old age in the process, but not before ensuring they will reach their destination safely. The flagship contains the young Lord of the ThunderCats, Lion-O, as well as the ThunderCats Cheetara, Panthro, Tygra, the “ThunderKittens” WilyKit and WilyKat, and a representative of the race of Snarfs. - ThunderCats Wiki