Besides the all-you-can-eat pancakes, the Super Duper Slam is the same as the Super Slam (which you can still order for $5.99) and includes two bacon strips, two sausage links, hash browns, and two eggs. Basically, for a buck more, you can get all-you-can-eat pancakes.
The timing of the deal coincides with competitor IHOP's similar all-you-can-eat pancake special.
Photo via Denny's.