Preheat the oven to 350 degrees Fahrenheit and prepare a 9x13 inch baking pan with a light coating of cooking spray. Set aside.
In a large bowl, combine cake mix, water, vegetable oil and eggs. Mix until thoroughly combined.
Pour batter into the prepared baking pan and bake for 25 minutes or until a toothpick inserted in the center comes out clean.
Allow the cake to cool, then using the handle of a wooden spoon poke holes over each inch of the cake. Set aside.
In a medium bowl, whisk together the jello mix and boiling water.
Pour jello over the cake, being sure to pour inside the holes.
Refrigerate for one hour.
Spread the whipped topping over the Jello layer.
Top with sliced lime slices and zest. Serve.
The calories shown are based on the cake being cut into 15 pieces, with 1 serving being 1 slice of cake. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information. The information in the nutrition box are calculated through a program and there is room for error. If you need an accurate count, I recommend running the ingredients through your favorite nutrition calculator.**