Melkor

Melkor are a Peacekeeper Lieutenant with the command of a small commando squad, that sneaks on board Moya in the Farscape episode "Exodus from Genesis''.

The first thing they discover are what they belive to be the dead body of Aeryn Sun, not knowing that it's only one of the Drak replicants. While they move through the ship towards the command they encounter several Drak replicants. Melkor ends up being the only one of his squad that don't easily subcomes to the Sebacean Heat Delirium, and ends up striking a deal with Crichton about leaving Moya and give Crais a message from him.