Scorpion's Sting

Tigress comes down with a case of the childhood illness: River Fever.
The only cure is the tea made from the Sun Orchid which can only be found the Valley of the Scorpion.
Po and Monkey take on the dangerous task of obtaining the flower but Monkey is captured by Scorpion and is brainwashed into destroying Po.
Po must stop his friend and get the cure back to Tigress before sundown.