The Atom Ant/Secret Squirrel Show is an hour-long Saturday morning cartoon produced by Hanna-Barbera Productions from 1965 to 1967 for NBC. In fall 1965, the show aired as two independent half-hour programs. The Atom Ant Show featured the tiny superhero Atom Ant, with additional segments Precious Pupp and The Hillbilly Bears. The Secret Squirrel Show featured the master spy Secret Squirrel, backed up with Squiddly Diddly and Winsome Witch. In the winter, the shows combine into an hour-long format, The Atom Ant/Secret Squirrel Show. For the series' final NBC run under the Atom Ant/Secret Squirrel title, the show was one half-hour long.