Restoration of the Cyber-Empire

The Restoration of the Cyber-Empire was an effort undertaken by Ashad to restore the Cyber-Empire following its fall at the end of the Cyber-Wars.

Fall of the Cyber-Empire
During the Cyber-Wars of the far future, the Cyber-Empire was eventually defeated, leaving both the Cybermen and humanity decimated. The survivors of humanity were hunted by the survivors of the Cybermen with many humans fleeing through the Boundary to other parts of the universe. (TV: Ascension of the Cybermen)

During the war, the Alliance, including General Ko Sharmus, sent the Cyberium back through time and space to hide it from the Cybermen. (TV:Fugitive of the Judoon, The Timeless Children) Ashad, a partially-converted Cyberman survivor, began searching for it in an effort to restore the fallen Cyber-Empire (TV: Fugitive of the Judoon, The Haunting of Villa Diodati), transform the Cybermen into a purely robotic race and use the death particle in order to wipe out all organic life in the universe. (TV: The Timeless Children)

A Warning from an Old Friend
In 2020, while the Thirteenth Doctor was battling the Judoon on Earth over a mysterious incarnation of herself, her former companion Captain Jack Harkness abducted her current companions Ryan Sinclair, Graham O'Brien and Yasmin Khan by mistake while trying to get the Doctor. On the run and low on time, Jack informed Team TARDIS about the fall of the Cyber-Empire and that the Lone Cyberman was searching for something and that the Doctor must not give it to him no matter what. The Doctor's companions passed this warning on to her upon being reunited. (TV:Fugitive of the Judoon)

Battle for the Cyberium
Ashad eventually managed to track the Cyberium to June 1816 where the AI had taken the host of Percy Shelley at the same time that Team TARDIS arrived in the era in an attempt to learn the truth behind the famous story of Frankenstein's monster, something which Ashad himself ultimately proved to be the inspiration for. Recalling Jack's warning, the Doctor and her companions fought to keep the Cyberium out of Ashad's hands with the Doctor managing to become the AI's host herself. However, after Ashad threatened to destroy the Earth by summoning his ship, the Doctor reluctantly handed over the Cyberium rather than risk the Earth being destroyed in 1816. Ashad departed for his own time, victorious and the Doctor and her companions followed using coordinates supplied by Percy. (TV: The Haunting of Villa Diodati)