You're not fooling me, Brennan Lee Mulligan.

I know Keen isn't gone for good. You know as well as I that Wizard Keen being bisected is the perfect opportunity to bring him back with robot spider legs, a thing that is no doubt possible but highly likely for The Citidel to do. You don't just throw away "The Most Evil Man in the World 2 episodes after introducing him. Keen will return.