Engine failure after oil change

I guess it turns out that I am a moron. The oil plug is not present as I look. Since there is no oil on my garage floor, I figure I started putting it in and got distracted by one of my 3 kids under the age of 5, and it subsequently loosened and dropped out during the drive. The dip stick right now is dry and there are metal filings on the dipstick. Took out all the plugs and the socket will not move the engine even a few degrees. I'll try the mystery oil in the cylinders, but I must have run it dry for a few miles at least.