The guys engage in the latest technology fad, Robot Wars. They create one and do battle with Kripke. Kripke is a nerd like them. He has an obvious speech impediment with which he seems totally comfortable. I don't know if this is the greatest episode, but the scene where Penny is coming up the stairs and the thing goes through the door is worth every minute. There is also an ongoing thing between Howard and Penny after she insults his juvenile behavior.
Review of The Killer Robot Instability
