It wasn't on Adult Swim, it was on Cartoon Network. It never really was "cancelled" but kinda just put on hold after Season 4 because the production team moved onto doing the Clone Wars micro-series and, once that wrapped, they kinda just naturally went their separate ways.
It took 15 years but it's back to wrap things up. Two more weeks, gang.
It took 15 years but it's back to wrap things up. Two more weeks, gang.