Upon hearing that Master Oogway had picked someone to function as Dragon Warrior, Tai Lung made his move escaped from prison. Throughout his trip back to the Valley, Tai Lung had apparently heard about the Dragon Warrior, how he 'fell from the sky in a ball of fire' and was 'a warrior unlike anything the world has ever seen' He was eager for the chance to fight a 'worthy opponent' and declared that their struggle would be legendary.
Trained by Shifu at the Jade Palace, Tai Lung was raised under the impression that he was to become the prophesied Dragon Warrior. But after he was denied the name by Master Oogway, Tai Lung revealed his true dark nature by ravaging the Valley, resulting in his incarceration for twenty five years. After breaking out of prison, he sought to claim that the Dragon Scroll and take his place as the Dragon Warrior once again, fighting and defeating many warriors in his pursuit. But despite being a warrior of great strength and determination, Tai Lung finally met his match when he was defeated by Po, the true Dragon Warrior.
Tai Lung was discovered by Master Shifu as a baby cub, wrapped in swaddling cloth and left at the threshold of the palace gates. Moved with compassion, Shifu decided to embrace the cub and raise him as his own, bestowing on him the name 'Tai Lung' in the hopes he would become the mythical Dragon Warrior.
Meanwhile, Tai Lung's anger had intensified a hundredfold when rotting and plotting in jail for the next twenty years. When he escaped, he made his way back to the Jade Palace where he confronted Shifu once more. This time, he attempted to talk calmly to Shifu, addressing him respectfully as 'Master'. However, Shifu grimly insisted that he was no longer his master, which they were to engage in battle. During the fight, Tai Lung unleashed his anger and blamed Shifu for what went wrong before, from allowing Oogway's decision stand due to his 'weakness', to being the one who gave him the ideals of getting the Dragon Warrior.
Grabbing Zeng from the neck out, Tai Lung politely told him to fly back to the Jade Palace with a message of his own: 'The actual Dragon Warrior is coming home'. After letting the goose go, he set out to return to the
Leaving him under the supervision of Commander Vachir and the Anvil of Heaven, Master Shifu and Oogway parted ways from Tai Lung, leaving him to serve out the remainder of his days at the prison as punishment for his crimes against the citizens of the Valley of Peace.
After a brief attack where he had been deflected by Tigress, the bridge was cut and then held by the rest of the Five as Tai Lung casually demanded to know where the Dragon Warrior was, and laughed as Tigress indicated that it was her. Tai Lung had heard rumors of the Dragon Warrior's look, that he 'fell from the sky on a ball of fire,' and was 'a warrior unlike anything the world has ever seen.' Monkey unintentionally let slip that the identity of the Dragon Warrior was named Po, and inquisitive, Tai Lung declared he would eventually have a worthy competitor for a mythical battle.
In the first movie, Po is shown to be living with his adoptive father Mr. Ping and working at his noodle shop, dreaming of a life as a celebrated kung fu master. However, due to his excessive weight and work fueling a crippling self-loathing, he can't achieve this dream. But to his surprise, he's chosen to be the legendary Dragon Warrior seemingly by accident: having arrived late to the Dragon Warrior's selection ceremony, his attempts to get over the palace walls to observe the event, lead to him conspicuously crashing into the middle of the masters just as Master Oogway is going to make his choice, and being picked as the new Dragon Warrior. As it is, Oogway's choice of him is doubted by all until Po defeats Tai Lung. He is capable of remarkable feats when motivated by food .
There was nothing else to do but prevent such devastation from happening again. Shifu bowed to Master Oogway's wishes and helped oversee the construction of the ominously impressive Chorh-Gom Prison, located in the frigid outskirts of Mongolia. Carved right from the mountain, the prison has been made specifically for Tai Lung--filled with many walkways and traps, with just 1 way in and out for the whole prison. In the deepest aspect of the prison, Tai Lung was chained and fitted with a controlling tortoise shell, with various acupuncture needles in critical places along the leopard's back, keeping his chi blocked and making him nearly fully immobile.
In the second movie, Oogway makes a cameo taking in place of the moon boy in the DreamWorks logo, and through a flashback wherein Po recounts all the major happenings of his life, including the day he was chosen as the Dragon Warrior. From the accompanying film Secrets of the Masters, it's shown that Oogway was responsible for joining the masters Thundering Rhino, Storming Ox, and Croc for the first time. After observing the trio as dishonorable streetfighters and understanding of the return of the wicked Wu Sisters, Oogway led them on a quest to defeat the villains, leading to the trio's reformation and their part in forming the Experts Council.
Not much is revealed about Grand Master Oogway's past life, although in one of those Kung Fu Panda Legends of Awesomeness episodes it is revealed that the Jade Palace was built to honor him. However, it's implied that he was probably full of questions as a youth, which resulted in his death from his home in the Galápagos Islands on a trip of discovery almost a thousand years ago, traveling all over the world and visiting each country until he arrived in China. Oogway stood on a hill overlooking the land that would later become known as the Valley of Peace and knew that he had found the place he would call home for the rest of his life.
When he had been a few years younger , Mantis was extremely impatient, believing that the world was too slow for him and he was too fast for the world. On a mission to retrieve wool coats back from the Wool Stealing Crocodile Bandits , he was seized due to his overconfidence and lack of listening skills when among the sheep villagers attempted to warn him of the bandits' traps. Mantis was locked in a cage and forced to sit and wait for something to happen, and he entered a trance that allowed him to survey the world moving faster than he did. This allowed him to develop the patience required to devise a plan of escape, playing dead to trick the crocodiles into opening his cage and defeat them.