Preheat the oven to 350°F (175°C).
In a large mixing bowl, combine softened cream cheese, mayonnaise, and 1/2 cup of mozzarella.
Fold in the cooked shrimp, lump crab meat, chopped spinach, and minced garlic.
Add Worcestershire sauce, grated Parmesan, salt, and pepper—mix well.
Transfer the mixture to a baking dish and spread it evenly.
Sprinkle the remaining mozzarella cheese on top.
Bake for 25-30 minutes, or until bubbly and golden on top.
Let the dip cool for a few minutes before serving.