[[Image:Ultima7-bg-guardian-exult.png|thumb|250px|right|The Guardian from ''Ultima VII'' intro]]
The Guardian is first seen as a giant red face that appears on the [[Avatar (Ultima)|Avatar]] 's computer screen at the beginning of the game. He proclaims:
Know that Britannia has entered into a new age of enlightenment! Know that the time has finally come for the one true Lord of Britannia to take His place at the head of His people! Under my guidance, Britannia will flourish, and all the people will rejoice! And pay homage to their new... Guardian! Know that you, too, shall kneel before me, Avatar. You, too, shall soon acknowledge my authority - for I shall be your companion... your provider... and your master!"''
The Avatar is brought to Britannia by a [[Moongate]] soon afterwards. As he explores the land, it soon becomes apparent that his is journey is indeed being monitored by the Guardian, whose voice can periodically be heard commenting on the various situations the Avatar encounters. At first an enigmatic character, the Guardian's commentary is often mocking, but at times appears to be almost helpful (on a couple occasions he warns the Avatar of approaching danger, and also admonishes the Avatar for stealing).
Ultimately, the Avatar learns from the [[ Time Lord (Ultima)| Timelord]] that the Guardian is an evil extradimensional entity, a powerful being that enters into worlds and proceeds to conquer them with his god-like powers. The Guardian is also revealed as the source of the crisises plaguing Britannia: 3 blackrock generators that focus his power into Britannia 's dimension are causing magic-users to go insane, disrupting the moongates, and allowing him to speak into the minds of Britannia's people.
The Guardian is also revealed to be the truth force behind [[The Fellowship (Ultima)|The Fellowship]], an aggressively proselytizing organization that has used its seeming benevolence to infilitrate every facet of Britannian society. While most members of the Fellowship believe the organization is merely a path to enlightenment, the high-ranking members know the truth: every member of the Fellowship is actually worshipping the Guardian as their god.
The Guardian has been using the Fellowship to construct a massive Black Gate on the Isle of the Avatar, which would allow the Guardian to physically enter Britannia from the Great Ethereal Void and conquer the land. The Avatar succeeds in foiling the Guardian's plot and destroying the Black Gate, but as a result he is unable to return home to Earth as the Black Gate was the last existing extradimensional doorway left in Britannia.
===''[[Ultima Underworld|Ultima Underworld II]]''===