Originally Posted by
resonance7982
Even in the event that Zerg are not able to be turned by the lich king, warcraft lore has much more raw power, having things like undead warlocks and mages in his army could devastate massive portions of the zerg army with a single spell, and the warcraft lore has plenty of ways to travel through space. steal draenei tech, open portals to other planets, if he wants a way off the planet, he will find one.
and even in they can't be turned their selves, they could incorporate their body parts and bio weaponry into new abominations.
Magic is the biggest deciding factor in this, the warcraft universe simply has more means of incredible power.