Follow the Bouncing Bag (S03E05)

While Rudy and Penny are at Chslkzone on a park sidewalk, Rudy accidentally leaves his backpack resting beneath a bench. This backpack contains the mini chalkboard that serves as a portal to Chalkzone. Spotting Rudy, Vinnie sees an opportunity for revenge and a chance to prove the existence of Chalkzone. Unable to locate Rudy, he attempts to force open the backpack to uncover the secret of the portal. When Rudy realizes Vinnie's intentions, he quickly activates the portal, prompting Vinnie to pursue the backpack through Plainsville.