Long, long ago, the Rhino Beast was a pet of the Fire Tribe with others until the war and Chi water caused many of his gorilla brothers to evolve. Because he knew that they all had inner chi, the Rhino Beast chose not to drink the Chi water and instead left Chima with seven other Legend Beasts, vanishing into the Outlands, but said to return when Chima needed them most.
When the Dark Tribes were created, he was captured along with the other legend beasts so the chi falls would not restart while they stole all the Chi.
The Rhino Beast was held in the Spider Canyon until the eight Chima heroes found him along with the Gorilla Legend Beast. It gave Rogon enough intelligence to find out that Rinona was hiding on his Rock Flinger and how to free it: by bowling his trap. He then leaped onto it and they escaped, when Rogon realised Eris was missing. They then went back and rescued her, then escaped Spinlyn's attacks easily before breaking her tooth with a rock and escaping to the Outland Base. Lavertus gave him armour to protect his mind from the Scorpion Tribe's venom.
Later on, when it went for a walk, Rogon was back to his simple old self again because the Rhino Beast was too far away to boost his intelligence.
He was ridden by Rogon to the Scorpion Cave to rescue the Raven Legend Beast. They kept the Scorpions busy while Laval, Lavertus and Razar rescued the Raven Beast. After the Raven Beast helped defeat the Scorpions, they fled back to the Outland Base.
Rogon later rode him again to rescue the Eagle and Bear Legend Beasts, and thanks to the advanced intelligence from the beast, he was able to get them a shortcut to the see-saw trap, allowing Gorzan and the Gorilla Beast to hold up the slab of rock the Bear Beast, Laval and Bladvic were on. When they lost their grip on it, Rogon and the Rhino Beast let the water loose to soften their fall. They then escaped back to the lair.
Worriz later pit the Legend Beasts against each other to see which was the mightiest, and the Rhino Beast was the first to get the rock, but the Gorilla Beast snatched it off him. The Rhino Beast later crashed with the Bear Beast when the Gorilla Beast took it off from the middle, when they all got distracted by Lavertus' cupcakes.
Rogon rode the Rhino Beast throughout the final battle in the Scorpion Cave until it collapsed because Rogon and Scorm blasted the roof. Thanks to Lavertus and Rinona in the Wind Shadow, they were able to escape before it collapsed. They then returned to Chima and restarted the Chi falls, entering Mount Cavora.
Laval, Cragger and Eris later found the Phoenix Fire Temple in Mount Cavora and the Legend Beasts, who had somehow had their armour removed, used their fire power to send them up into the temple to meet the Phoenix Tribe.
The Legend Beasts later attacked Laval and Cragger with their fire power as part of the trial to see if they were worthy of the Fire Chi, which they passed.
The Phoenix later let it loose in response to Eris' Panthar dream.