Preheat your oven to 350 degrees. In a medium-sized bowl combine imitation crab and lobster meat. Add the shrimp and mayonnaise. Stir the ingredients well.
Add the sliced green onions, and lightly stir. Place seafood into a 1-quart baking dish that you have sprayed with non-stick spray. Add 1/2 cup Mozzarella cheese. Bake for 25 to 30 minutes.