Many athletes from diverse sport teams have been abducted by a giant race of men, and now they have to play (and win) an unusual sport in order to entertain the giants, or else they would be shrunk and would act as assistants to the players that haven't lost.
The giant Coach likes to inspire the players in a unique way, specially one of them.
The new arrivals have the chance of a practice round in which they'll be tested, since they are trained in different sports new teams need to be balanced before they can start participating for real. The best players have the option to improve their body musculature or size so they can win against more experienced teams.