The Baby Baboon first appears when Jane leaves her expedition group briefly to sketch him when he appears in her path. He doesn't hold still long to look at Jane's progress and likes her drawing of him so much that he steals it from her, Jane gets it back by tricking him. The baboon cries, not getting its way, prompting his entire family to show up and attack Jane. Running for her life, Jane is soon found by Tarzan and the two make a thrilling escape, though Jane loses a boot and her parasol in the chase, which the baby baboon has taken along with the drawing that Tarzan ends up grabbing and handing to him as he floats down to the jungle floor.
Later in the film, the baby baboon and the troop come to help Jane and Tarzan fight Clayton's thugs off when they threaten to capture the gorillas. The baby baboon (wearing Jane's missing boot as a hat) signals for an attack and his horde chase after the thug who was about to attack Jane. The baby baboon then kisses Jane and follows his horde.
The Baby Baboon, named Manu in the series, makes a few appearances throughout the show, where here he is shown to be good friends with Tarzan and Jane in a couple of episodes.
In "Tarzan and the Lost Cub" the leopard cub Terk and Tantor were babysitting messes with Manu, which angers his entire baboon troop, prompting the baboons to chase after Terk and Tantor before they get scared off by Tarzan.
In "Tarzan and the Rough Rider", Tarzan introduces Manu to Theodore Roosevelt to learn to speak in monkey language, where the former president accidentally said something derogatory that offended Manu in monkey language.
He played a vital role in "Tarzan and the Lost Treasure" in warning Tarzan that Rokoff planned to kill him after he got the treasure from him, even turning to Jane to tell her the news, even though she struggles understanding and replying to him in monkey language.
In "Tarzan and the Hidden World" he took pictures of himself with Philander's camera, causing him to lose film which caused him to unable to capture the photos of the dinosaurs as he wanted, and therefore humiliating Philander as a huge laughing stock among his fellow London scientists.
Despite him being a baby baboon, he physically resembles more like a monkey than a baboon, at least when compared to the alpha baboon and rest of his troop, such as him having brown fur unlike the rest of his troop who all had greyish fur, and obviously lacking a long, dog-like muzzle and rough spots on their protruding buttocks called ischial callosities, physical features that are commonly associated with baboons and the closely-related mandrils. This could have been a mistake or perhaps he is meant to be a very young baby baboon.