The body of the drab leader lays in front of you.  He croaks "How can you 
contain so much power? It is not possible!  I was corrupted by a huge 
Overlord who infects things and invades worlds.  He creates new powerfull
beings and will now conquer earth! You must stop him! You are strong enough 
to.  But be careful, he has a powerfull army of monsters.  You don't need to
worry about me.  Destroy the prison with the autodestruct and find the over
l--oo..." he falls flat to the ground.

Thanks mutters Duke.  But where could he be?  Suddenly, a wall opens in front
of him with an autodestruct pannel and an area that seems to be a hyperspace
tunnel.
