I accidentally left my dough out for 2 days. It is in plastic container. Is it safe to cook and eat or should I dispose of it?
From a safety point of view, unless you think it is moldy or something, it should be ok.
From a good pizza point of view, the dough may be "blown", watery with no life gooey, blech...
What does it look like? I would think you would know right away if/when you remove it from the container, inspect it and try to open it. I hope that you have put it in the fridge by now to , at least, arrest/slow down further development.
If it were me and the dough was messy, yucky, hard to work with - I would toss it. The real money is in the toppings.