The deal is being touted as the "Touchdown Offer," as it coincides with the start of National Football League (NFL) season on Thursday. Friday also happens to be National Cheese Pizza Day (who knew?).
The deal is only good when ordered online using the promo code: BIGCHEESE.
Of course, if you actually want toppings besides cheese, they've been offering an online deal for $7.99 2-topping, large pizza recently.