Poor Gus! He's so gullible, he believes everything people tell him. Everything! The other cowboys feed him lies and tall tales - just to see if he'll swallow their silly stories. Their teasing makes him sadder than dry soup. But luckily, Doc Hickory knows a cure for gullibility, and it starts with a visit to Fibrock, a town full of liars. Can the biggest fibber in Fibrock teach Gus the difference between fact and falsehood? Maybe it's not always clear which is which...