This is basically a combined idea of Danny Phantom with Bramble the Mountain King with a slight twist of idea and plot. Let's just call it, "Phantom the Ghost Zone King".
Quick plot of the story.
Jazz was kidnapped by Skulker and was taken into the Ghost Zone. Danny Fenton had to find the way to rescue her before she got killed by the insidious Ghost King, Phantom.
All the ghosts suffered terribly because of the havoc wreaked in the Ghost Zone by King Phantom and his followers, after the King was affected by a curse and lost his "heart".
Fenton embarked on a journey into the Ghost Zone to find his sister, and he helped the friendly blob ghosts and many other residents there along the way. In return, they helped him to access areas and pathways that not many ghosts dared to go.
Throughout Fenton's travel, there were dangerous foes threatened to capture him and kill him. The only way that Fenton could fight back was by using the crystal core of the Ghost King that he found during his journey.
He would use the core of the Ghost King to aim at his foes and it created an ectoblast.
In the final journey, Fenton would have to meet King Phantom face to face to reverse the curse. He would need to return the King's "heart" quickly before the King attempted to kill him and his sister.