Preheat the oven to 350 degrees F and grease a 9x13-inch baking dish. Set it aside.
Pour the cake mix, eggs, water, and vegetable oil in a large mixing bowl and blend them with a hand mixer until the ingredients are well combined.
Pour the cake batter into the prepared baking dish and bake it for 20 to 25 minutes or until the cake springs back when touched. Remove the baking dish from the oven and allow the cake to cool for 20 minutes.
Once the cake has cooled, poke several holes halfway into the cake with the end of a wooden spoon, (spacing the holes approximately ½ -inch apart).
In a medium-sized bowl, combine the gelatin powder and boiling water, and whisk until completely dissolved.
Spoon the Jello liquid over the cake, ensuring it gets into the holes. (Any remaining liquid can be poured over the cake). Place the cake in the refrigerator and chill for at least an 1 hour to allow the gelatin to set.
Remove the cake from the refrigerator, and using an offset spatula, spread on the Cool Whip, and top with strawberries.