Happy Birthday, Cliff Hanger! is a book from the The Adventures of Cliff Hanger book series. Video[edit | edit source] Between the Lions- Happy Birthday, Cliff Hanger! Retrieved from "https://betweenthelions.fandom.com/wiki/Happy_Birthday,_Cliff_Hanger!?oldid=7240" Categories: Books Stories The Adventures of Cliff Hanger books Vhs Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.