ThunderCats 1985 Season 4 Episode 19 Well of Doubt Episode Title:Well of Doubt.Episode Description:The ThunderCats use a new Tower signal to guide a Thunderian ship in; aboard are Baron Tass and Mr. Grubber, a devious pair of Thunderians. Later, Lion-O sends Torr, Baron Tass and Mr. Grubber to get water. On the way, the Baron stops at the Well of Doubt and gets some of its water, which causes a person to become very doubtful of his own abilities. When they get back to the ThunderCats, Baron Tass gives some of the water to Lion-O. On the way to inspecting the new Tower in the Whisker, Lion-O feels the effects of the water and causes the Whisker to crash. Tass comes back after getting his Guardsman – giant stone-men – and has them attack the ThunderCats.