Quick recap
Po finds out Mr. Ping gave away his Furious Five action figures as a customer freebie and goes looking for them. Meanwhile, the story jumps back ten years, before the first movie. Young Tigress trains under Shifu but never pleases him. Little Po sneezes into Shifu's soup, and Shifu gets sick just as the warrior Boar comes to challenge the Valley of Peace. Shifu sends Tigress to recruit fighters, but a mixed-up list leads her to a cleaner, a comedian, a dancer and a doctor: Crane, Monkey, Viper and Mantis. Tigress loses while copying Shifu, then beats Boar by being herself, with the four at her side. Back in the present, Po lets a bunny fan keep the toys.
No spoilersOpens once you mark the title as seen.