Alastair Montague

Alastair Montague was an eccentric billionaire and owner of ChronosCorp HQ who wanted to build a time machine to travel the universe. However, something went wrong and caused a rift in time and space through which the Cybermen broke through. Montague was potentially killed or "upgraded" as a result.

The Thirteenth Doctor discovered this calamity and sent her companions to help sort out the situation. (NOTVALID: Worlds Collide)