S6E16: The Mass Demon

With a simple finger snap, the people Amity enticed with her videotape all come in droves, as if they are zombies.

Not us, and not even the boombox guy, are spared from getting overwhelmed by the horde.

She declares, "Now you know why this videotape of mine exists in the first place! So that I can feed off their gullibility!"

And with another finger snap, she summons a beat-up Formula 1 racing car from the sky….

...which then fuses with Amity and the videotape victims to form...

A monster.

A monster standing twice as tall as us.

A monster that takes up the main form of the Formula 1 car, but is embedded with the skins of the people she enticed with the videotape.

The remaining vestiges of Amity, which are her limbs, are turned into bio-mechanical arms and legs that, judging by their size vis-à-vis the main body, pack their own punch.

The "slapper arm" she had, in particular, mutates into an arm carrying three sharp blades that substitute for the left hand.