Cartoon Network Preview
Text taken from Cartoon Network's Website. Note that for part one and part two they use the same preview write-up.
Season 1 - Episode 2
Fleeing the destruction of their home planet Thundera, Lion-O and the ThunderCats land on the mysterious, dangerous, all-around awesome world of Third Earth! But their enemies, the Mutants of Plun-Darr have followed them and it turns out Third Earth already has a Mumm-Ra problem, can Lion-O learn the ropes of being a leader in time?
Lion-O enters the pyramid to thank Mumm-Ra, only to learn he is evil while revealing the presence of the other ThunderCats on Third Earth. Mumm-Ra, explaining his Doomstaff grants him power while establishing a curse where anyone who says his name is struck by lightning, chains Lion-O up and uses a portal to attack the ThunderCats' new home. Mumm-Ra makes short work of the team despite their resistance, with Lion-O and Snarf arriving too late. Things seemed hopeless until Mumm-Ra unintentionally praised the Berbils as they hug him with his own curse used against him, enabling the ThunderCats to break free with Lion-O destroying Mumm-Ra's staff. Mumm-Ra, reverted to his natural form, escapes and Lion-O promises to stay with his team and lead them to victory.