[3] The film stars the voices of Daws Butler, Don Messick, Julie Bennett, Mel Blanc, and J. Pat O'Malley.

Smith believes "The Brown Phantom" is a mysterious bear-like vigilante whom the Park Commissioner hired to replace Yogi, and scares away all of the Jellystone goers and gobbles their food up shortly after stealing it.

After an extensive travel, Yogi and Boo-Boo locate Cindy, who is being kept a prisoner, forced to perform her high-wire act for the Chizzling Brother's circus.

Meanwhile, Ranger Smith decides to let them find their way home to avoid trouble with the Park Commissioner, who thinks Yogi, Boo-Boo, and Cindy are "The Brown Phantom" and Smith's two henchmen, who bring the picnic baskets to it after its scares, and they send the police to hunt down "The Brown Phantom", which is the second part of his plan.

As Yogi, Cindy, and Boo-Boo make their way home, they crash a barnyard party, somehow escaping afloat a river with the barn's door.

Then, while Cindy & Yogi dream about a honeymoon in Venice, they find themselves suddenly being chased and hunted by the police, as they somehow became fugitives, but make their escape.

The next morning, Ranger Smith sees the three bears on television and decides to rescue them from "The Brown Phantom" in a helicopter as the final part of his plan to save Jellystone.

[7] When the Warner Bros. Cartoons studio closed in 1963, several of its animators, including Gerry Chiniquy and Ken Harris, also joined Hanna-Barbera to work on this film.

A review from the May 27, 1964, issue of Variety pointed out that the scarcity of theatrically released feature animated films made Hey There, It's Yogi Bear!

Unlike a concurrent DVD release of another Hanna-Barbera feature, The Man Called Flintstone, it is presented in 1.78:1 anamorphic widescreen (both films were animated in 1.33:1 and matted to 1.85:1 for theaters).