It's a Mystery, Charlie Brown When Woodstock's fancy new nest disappears one afternoon, he turns to Snoopy for help. Adopting the guise of Sherlock Holmes (complete with cloak, deerstalker cap and bubble pipe), Snoopy and Woodstock go on the hunt for the missing nest. Details Casts Galleries Posters Title It's a Mystery, Charlie Brown Release Date 1974-02-01 Runtime 00 Hours 25 Minutes Genres Animation Comedy Production Companies Lee Mendelson Film Productions, Bill Melendez Productions Production Countries United States of America Todd Barbee... Charlie Brown... Melanie Kohn... Lucy... Stephen Shea... Linus... Donna Le Tourneau... Peppermint Patty... Jimmy Ahrens... Marcie... Lynn Mortensen... Sally... Tom Muller... Pig Pen... Original Size (3840x2160) Original Size (1920x1080) Original Size (572x986) Original Size (571x940) Original Size (1000x1500)