Bounty

A crafty Tellarite tricks Archer into boarding his ship and kidnaps him to collect a Klingon bounty. They want to punish Archer because he is the only prisoner to escape the prison planet Rura Penthe. As Enterprise pursues, contamination by a stray virus while exploring an uninhabited desert planet prematurely starts T'Pol's mating cycle, the pon farr, where she must mate or die.

Synopsis adapted from TVmaze (CC BY-SA 4.0)