Ignition was left on overnight. Now it doesn't crank. What could be wrong?

When a car battery is completely drained, it is often ruined. Especially if it's a few years old. Only "deep cycle" batteries are designed for being able to drain and re-charge. Now, on the chance that the battery was not ruined, a dead battery should no be left to be re-charged by the alternator. It will overload the alternator, trying to charge the battery too fast. Always re-charge with a trickle charger first. So.... a couple things might have happened. The alternator fuse in the underhood box blew, or the alternator burned up -- and to state the obvious -- will not charge your battery (If it will even accept a charge)

Now, that's all generic automotive electrical information. But there is another possibility, the anti-theft security system. That needs to be answered by somebody that knows Dodge anti-theft systems, and that I don't know

The alternator is testing good. The interior lights, radio, fan blower all go off briefly when trying to crank it. The dash lights all stay ON. I was also thinking the anti theft could have me locked out.