In "Hometown Hero", Sai So and Dosu challenged Mantis and his sidekick Po to a duel for the "hand" of Hao Ming, Dosu's ex-girlfriend who dumped him for Mantis after learning that he was the Dragon Warrior. Neither of them were aware that Mantis was in reality not the Dragon Warrior, having lied to the entire village in order to get back at Hao for jilting him.
Unfortunately, Mantis was too occupied with Hao to turn up to the duel, leaving Po (the real Dragon Warrior) to suffer a beating at the hands of Sai So and Dosu. Dosu rescheduled the duel, but Mantis again didn't arrive, and Po again got beaten. This went on several times before Po decided to return to the Jade Palace.
In a forest outside the village, Sai So and Dosu discovered Po performing excellent Kung Fu while relieving his frustrations, and figured out the truth. Sai So informed Dosu that Hao must know the truth before she marries Mantis. Dosu and Sai So rushed back to the village, with Po in pursuit.
At Hao and Mantis's wedding, Po struggled to fend off Sai So and Dosu, and the pair furiously began beating the panda again. However, Mantis chose helping Po over marrying Hao, and kicked Sai So off of the panda, sending the goat flying over the wall out of sight.
Sai So is just as aggressive and persistent as Dosu, even directly threatening Po upon first meeting him. Similar to Po's tendency to make weird noises (as part of his sidekick act), Sai So has a habit of whistling.
Fighting styleSai So does not appear to have a specific kung fu style, instead choosing to use brute force.
Sai So wears a plain blue robe with a dark-colored belt.
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