Light of the Foundation: Part 3
In Light of the Foundation: Part 3,
humanity and the Ehrban make tenuous peace, then their real common enemy attacks, leading to the destruction of Earth and the apparent deaths of Metis and Xio.
In Episode 1,
the Berol, against whom the Ehrban are already at war, attack the Sol system, and Metis is thought by Xio to be killed, though she is secretly rescued by Kron.
In Episode 2,
as Sol is overwhelmed by the Berol invasion, a gravitic superweapon on Luna is deployed, then suffers a catastrophic failure that shatters the entire moon.
In Episode 3,
as Earth civilization collapses, Xio rushes to recover the copy of Metis from Virtuality, while Metis rushes to Earth to save Xio, and both seem to die with the rest of humanity.