A downloadable game for Mac OS X
The Mechanisms once did an album about the stories of the Knights of the Round Table told as an epic involving space cowboys and knife-weilding mutants. I'm honestly not a fan of most of their music, but the concept was about as badass as the Terminator movies. A video game has ensued.
Add additional characters (Sheriff Arthur, Guinevere)
Give the current character (Lancelot) a spacey sniper instead of the default unreal gun
Give the SAXX-1 Robots a gun so that they are actually threatening instead of looking marginally creepy.
Add the inside of the Round Table Tavern