Batman Beyond/Nightmare Fuel


 * "Lost Soul". First, the Batman suit is taken over by the cyber-ghost of a dead businessman. But wait, that's just so he can use the suit to be able to put his cyber-soul into the very meatspace body of his grandson. But that's not the HONF, oh no. That comes when Batman defeats the cyber-ghost, still in the Batman suit, causing his "program" to be wiped out, slowly. The cyber-consciousness get degraded, his mind devolving from teen, to kid (reciting basic arithmetic, no less), to infant, and then... gone.
 * "Earth Mover".