Everyone calls me Johnny

How you got here doesn't matter. What you know is that you are Syntwave City's last hope. A nuclear reactor has become unstable and is bending the rules of reality, physics has gone mad.  When arriving at the site, you find those up to no good cats messing stuff up.  They see you and fear strikes upon them. "Damn it! It's Johnny!" they say.  You get to the core of the reactor, this is the last stand. You must defend it or else the world goes boom. The task is hard, but c'mon, you are Johnny! You eat up world ending scenarios for breakfast!  You reach for your gun. The time is now. Save the world Johnny!