Cheeseburger, fries and shake at Sci-Fi. The burgers come with cheese, grilled onions, grilled mushrooms, and bacon if you want them. My DD & I split one with Swiss, onions and mushrooms and couldn''t finish it! Not your typical FF theme-park burger.
Their other sandwiches are good, too. I've had the reuben and loved it. Great theming, by the way, and it's what I think is the quietest restaurant in all of WDW!!! We love going there for lunch as a break from the crowds and noise of DHS.
We tried the pot roast at 50s -- it was ok, but nothing great.