The series told of the adventures of the mighty but compassionate warriors known as the ThunderCats, the last survivors of their home planet. The show focussed particularly on the growth and development of the ThunderCats’ young leader, Lion-O. Due to spending his adolescence in suspended animation, Lion-O was forced to grow into a man before the eyes of the audience, and this provided both for strong character development and for valuable life lessons to be introduced into the series’ storylines.
Season 2
Now eventually the main plot to Thundercats makes a sharp turn when their destroyed home is renewed. At the start of the series' second season, it was revealed to Lion-O that there are three more Thundereans living on Third Earth. They survived the cataclysm when rescued by a Ro-Bear Berbil scoutship piloted by two Berbils. The ship, damaged in the final explosion of the planet, made it to Third Earth, landing on an unknown island somewhere in the northern sea. They go to find the new thnudercats, and try to make use of their new home. But thier evil nemies Mumm-Ra also returns, to bring forth destruction.