A good "very special episode" about the dangers of stereotyping and prejudice. The old saying, "Dont Judge A Book By Its Cover" is the moral lesson of this episode. Two space aliens visit Lion-O and Snarf at the heroes headquarters, each claiming that the other won is a lying criminal and a tyrannt. Our heroes make the mistake of believing the alien that is more visually appealing and has a plesant sounding voice. Thus the moral message about the ills of prejudice and stereoyping.
After realizing his mistake, Lion-O summons the rest of the Thundercats to defeat the true villian and help out the other alien.