Danny Phantom (2004)

S1E8 Prisoners of Love

In "Prisoners of Love," Danny panics when he accidentally sends Jack's anniversary gift into the Ghost Zone, fearing it will lead to his parents' separation. Determined to get it back, he leaps into the eerie dimension, only to encounter Walker, the ghostly warden of a spectral prison. As a result, Danny finds himself incarcerated alongside all the ghosts he has previously captured, complicating his mission to retrieve the lost gift and mend his parents' relationship.