The virility gene is a well-known, if rare, commodity in the Universe that Hook knows. Rare because its source has hitherto been unknown. When the inhabitants of the planet of its origin decide to reveal that they are willing and able to trade in it, it is not surprising that a veritable 'gold-rush' starts. Even Hook and his companions are not averse to staking their claim, for the virility gene both increases and prolongs sexual pleasure.

Shaeel, Karg and Hook eagerly arrive at the weird planet, and manage to find a claim. But things start to go badly wrong when they discover the true source of the gene - and when the Boosted Men arrive to manipulate the virility gene for their own evil ends.