Mighty Joe Young

Mighty Joe Young

Professor Gregory 'Gregg' O'Hara

Andrei Strasser

Garth

Harry Ruben

Cecily Banks

Kweli

Pindi

Dr. Elliot Baker

Dr. Ruth Young

Young Jill Young

Vern

Jack

Jason

Jason's Mother

Commander Gorman

News Reporter

News Reporter

Gentleman at Party

Elegant Woman at Party

Impatient Driver

Boxer Shorts Man

Bambi's Owner

Street Kid

Street Kid

Street Kid

Street Kid

Cabriolet Girl

Cabriolet Girl

Cabriolet Girl

Cabriolet Girl

Conservacy Guard

Animal Control Duty Officer

Cop

Cop (as Neal Kopit)

Concerned Mother

Police Sharpshooter (as Wiley Pickett)

Carjack Man (as John T. Bower)

Toddler

Toddler's Mom

Panda Owner

Poacher

Society Man

Society Woman

Ticket Clerk

Mighty Joe Young

Baby Joe

Joe's Mother Gorilla

Joe's Father Gorilla

Other Gorilla

Other Gorilla

Baby Joe (voice) (as Darren Knaus)

S.W.A.T. Member (uncredited)

Party Guest Grabbed By Joe (uncredited)

Stand In For Robert Wisdom (uncredited)

Police Pilot (uncredited)

Security Guard (uncredited)

Kid (uncredited)

Carnival Worker (uncredited)

Tourist (uncredited)

Zoo Keeper (uncredited)

Terrified Carnival Goer (uncredited)

Preacher Wife / Vendor (uncredited)

Pedestrian (uncredited)

(uncredited)

Carnival Patron (uncredited)

Charlotte (uncredited)

Ferris Wheel Operator (uncredited)

Security Guard (uncredited)

Girl in Car (uncredited)

Carnival Patron (uncredited)

The melody being played on the boardwalk is "Beautiful Dreamer," the favorite of Joe in the original film.

Since Gorillas in the Mist (1988), (Rick Baker) stated that he would not do any more projects that involved creating animatronic apes. Baker had to break that statement when he did Baby's Day Out (1994), in which a scene features a gorilla. After that film he once again stated that he would not do any more ape projects, but when he got called to work on this film he changed his mind. It was because of Baker's love for King Kong and the original film that changed his mind. This would be his last film that Baker created an animatronic gorilla suit.

Like most films during the 1990's that features creature effects, Joe was created through the mixture of practical and digital effects. For the majority of the film, Joe was portrayed by creature suit performer ('John Alexander') who wore a radio-controlled animatronic gorilla suit created by special makeup effects artist (Rick Baker) and his crew at Cinovation Studios. In order to achieve those scenes, Alexander would often act on miniature sets that were surrounded by blue screen in which visual effects house DreamQuest Images would composite him into footage that was shot before. While in the beginning of the film when Joe was an infant he was performed by (Verne Troyer). For certain scenes, the filmmakers used three full-sized animatronics (one in quadraped, one sitting down, and one in a dead position) also created by Baker's crew. For the scenes where the digital Joe was used, visual effects houses DreamQuest Images and Industrial, Light, & Magic would work on different scenes using the same model provided by Baker. Many of these performances were achieved by key-frame animation, but when the digital Joe was running and jumping was motion capture data that they captured from an infant chimpanzee.

In Gregg's first appearance he refers briefly to a map, then orients himself with a magnetic compass, while resting the same arm on the steel hood of his Humvee.

Jill Young: [Gregg is holding out his hand to shake on their deal that Jill is in charge of Joe if they go with him to L.A] That's not how we make deals around here. You have to get bitten by a Mahooky Spider, you'll get a fever and delusions. You'll start to say things. Then if you're intensions prove true... we trust you.

Cecily Banks: [has just gotten word that Joe had arrived at the zoo] Okay, people! Elvis is in the building!

Andrei Strasser: My God... Pindi was right.