[2] Loki eventually restored Zarrko's memories, leading him to return to the 20th century with a giant mining robot and coerce Thor into helping him in exchange for not attacking further.

Zarrko then sent three devices to the Present to de-evolve that era to pre-industrial times, except for an area containing an American missile base, from which he planned to steal nuclear weapons and rule the 23rd Century, but this was stopped by Spider-Man and the Human Torch.

Zarrko sought to use the energy unleashed by their hammers in the clash to activate the radical Time Stabilizer device to use to collapse all the timelines into one.

Zarrko knew that in his future, Thor would become a tyrant, so he had to travel back in time and stop him before the Odin Force made him invincible and near-omnipotent.

[volume & issue needed] When the Governments of Earth launched a massive assault on Asgard, Zarrko was seen trying to escape with his time machine, only to be stopped by Thialfi.

[volume & issue needed] Zarrko's attempted time travel was instrumental for Thor to create for himself a new future in which he would never be the tyrant he would have been without his human self.

[13] Zarrko appears in "The Mighty Thor" segment of The Marvel Super Heroes, voiced by Rod Coneybeare.