In the fall of 1972, new one-hour episodes under the title "The New Scooby-Doo Movies" were created; each episode featuring a real or fictitious guest star helping the gang solve mysteries, including characters from other Hanna-Barbera series such as "Harlem Globetrotters", "Josie and the Pussycats" and "Speed Buggy", the comic book characters Batman and Robin (later adapted into their own Hanna-Barbera series, "Super Friends", a year later), and celebrities such as Sandy Duncan, The Addams Family, Cass Elliot, Phyllis Diller, Don Knotts and The Three Stooges. Hanna-Barbera musical director Hoyt Curtin composed a new theme song for this series, and Curtin's theme remained in use for much of "Scooby-Doo's" original broadcast run. After two seasons and 24 episodes of the "New Movies" format from 1972 to 1973, CBS began airing reruns of the original "Scooby-Doo, Where are You!" series until its option on the series expired in 1976.