Heat oil in a large skillet over medium heat. Add turkey. Cook until browned. Drain fat, if necessary
Meanwhile, cook spaghetti according to package instructions, drain and set aside.
Preheat oven to 350F degrees.
Add sauce (with 1/2 c set aside) and zucchini to turkey and mix.
In a greased 9x13 pan, spread 1/2 c of sauce. Cover with 1/3 of the spaghetti, top with 1/3 of the meat sauce mixture, and repeat with the remaining.
Cover and bake for 40 minutes.
Top with cheese and bake for an additional 5 minutes or until cheese is bubbling.
Let stand for 10 minutes and serve in squares.