Well of Doubt (S04E19)

The Thundercats activate a new Tower signal to help a Thunderian ship arrive, which carries the cunning Baron Tass and his ally Mr. Grubber. Later, Lion-O tasks Torr, Baron Tass, and Mr. Grubber with fetching water. They detour to the Well of Doubt, where the Baron collects some of its water, which instills uncertainty in anyone who drinks it. Once they return, Baron Tass gives Lion-O some of this water. As they head to examine the new Tower in the Whisker, Lion-O succumbs to the water's effects, leading to a crash. Baron Tass returns with his Guardsman, stone giants that attack the Thundercats. Jagara has the others hold the Sword, allowing Lion-O to grasp it and break free from the water's influence. He then battles the Guardsman and conjures a storm that dismantles them, prompting Tass to vow to reform.