Jonathan and Kohaku are members of Greco-Roman wrestling teams competing at the Olympics when the entire contingent of competitors is abducted by aliens. In the face of a common adversary experimenting on them, the group forms a new hierarchical social construct akin to a tribe.

As time passes, they notice subtle changes in their bodies. Finally, communication with their captors is established, and the men learn the aliens intended to release them as the dominant lifeform on a planet they’ve been terraforming.

The changes to their bodies were to prepare them for their new environment, and to enable them to reproduce. The aliens had mistakenly interpreted the Olympics as a grand mating ritual, and only during space travel realized they had gathered only one gender.