This is how Starlight Glimmer becomes a zombie goes in
[The scene begins at Juniper Montage's lair after she removed Starlight Glimmer's protoplasm from her body and is now talking to Starlight Glimmer's lifeless body]
Juniper Montage: Soon, revenge will be mine.
[Juniper Montage then releases a creature which opens Starlight's mouth and the creature goes inside of her by turning into a stream of mist that flows into her mouth and Starlight Glimmer turns into a mindless zombie]
Juniper Montage: Yes. You're now under my control.
[Starlight Glimmer bows down]
Juniper Montage: Rise.
[Starlight Glimmer arises]
[Then Starlight Glimmer speaks with a spooky voice]
Possessed Starlight Glimmer: What is your command, Mistress?