From what I’ve read, Ninja Tribunal was paused because 4Kids deemed it “too dark” and felt Fast Forward would accrue more interest (this was around the same time as the “Insane in the Membrane” fiasco). It wasn’t until after FF ended that 4Kids decided to finish the season with some minor changes, though they chose to have it put out on DVD first before airing it.
One episode didn’t get finished at all: it would’ve featured the return of Garbageman and it would’ve revealed he and Hun were conjoined twins who were horrifically separated by a shady surgeon. Baby Garbageman would then be called “garbage” and thrown away in a dumpster.
I can’t imagine kids would not be horrified by that.