Cook rigatoni according to package directions; drain in colander; set aside.
In a large Dutch oven, pour three jars of marinara sauce.
Add 1 tsp. oregano, the basil and and the fennel seed to the sauce and cook meatballs as directed below.
After meatballs are finished cooking, in large bowl, combine cooked rigatoni, 2 cups spaghetti sauce (from where you cooked the meatballs), ricotta cheese, 8-oz. bag of the mozzarella cheese, ½ cup parmesan cheese, parsley, egg, oregano, garlic powder and pepper.
In a greased 9" x 13" pan, pour 2 cups spaghetti sauce (from where you cooked the meatballs) and ½ the meatballs on the bottom of the pan; spread rigatoni mixture evenly over sauce.
Top with more meatballs and remaining spaghetti sauce and spread evenly; sprinkle with remaining half cup of parmesan cheese.
Push the meatballs down into the rigatoni mixture.
Bake covered at 375° for 30-35 minutes or until hot and bubbly.
Then top with additional mozzarella cheese.
Bake an additional 5-10 minutes or until cheese has melted.