1x17 - Ruby Gloom

Ruby's friends have made it to the finals in a big game show, thanks to Skull Boy, who believes that them winning is because of his good luck charm. But when Skull Boy loses his charm, he loses his confidence as well. Now, Ruby and the others must now try to convince Skull Boy that he doesn't need a good luck charm before the game show starts. (From: http://rubygloom.wikia.com/)