Titans ended with "The End", no other way to say it. Pure and simple, the big bad they had been building towards for four seasons, Trigon, was unleashed, Slade came back, allied WITH Trigon, so you had the two most enduring adversaries cross over with each other, Slade is revived, the series ends slightly open ended, but at least you know it had closure, dark, forboding, dramatic closure. It did'nt need to become Teen Titans Unlimited. It was all done.