 As their home world is about to explode, the Thundercat Royals escape. Their engine is damaged so they can t go to their intended destination. While the others enter sleep chambers to survive the long journey, their leader Jaga, remains awake to pilot the ship as long as possible since their navigation system is damaged. One they land on Third Earth, the Thundercats must deal with old enemies who have followed them, and face all the challenges that await them on Third Earth.