Sesame Street / Season 51 S51E05 Cardboard Castle Sesame Street Netflix Share WhatsApp Telegram X (Twitter) Facebook Copy link Aired 2148days : 12hours : 00min : 18sec Thursday, December 10, 2020 at 9:00 AM (Eastern Time) Synopsis This episode has no synopsis. Previous episode S51E04 Bye Bye Boo Boos Next episode S51E06 Holiday at Hooper's Data from TVmaze (CC BY-SA). Updated October 28, 2026, 19:31.