The fact that the Hirogen were originally imagined as having a larger build than the typical Human influenced the casting of the alien roles, making the task of finding suitable actors problematic. "When we were casting these guys for the first time," Joe Menosky explained, "Brannon didn't want to read anyone under 6 foot 7, 6 foot 6. It's really difficult to find the right people for roles anyway, so when you start hamstringing yourself by saying, 'We also only want people who are over 6 foot 7,' it gets really, really tough. If you look at all these episodes, you'll see a couple of these big guys, but mostly they're not."