Master Albert (マスター・アルバート), also known as Doctor Albert and called Mr. Albert by Hedgeshock the Erinaceroid, is the main antagonist of Mega Man ZX Advent. He was formerly one of the Sage Trinity, the proclaimed masters of the world in charge of the most powerful corporation, Legion, but betrayed them as he begun to speed up his centuries-long plan by collecting all of the fragments of Biometal Model W to "reset the world".

What appears to be a member of the Sage Trinity is actually a decoy, as revealed when Pandora and Prometheus turn on him and destroy his body.

It is possible that he has a connection to Serpent and, indirectly, Ciel or Dr. Weil, considering the numerous Model W are actually pieces of Ragnarok infused with the evil soul of Weil, the fact that it was Ciel who found Model W and created Models Z and X to counter it, and also the fact that Serpent was not only the first victim of Model W's evil influence but also its nature (as well as the fact that Aeolus's cipher stated a little-known code made by Albert that Maverick survivors were to report to Legion to get a blood donation from him, which also implies that Serpent was a Maverick survivor, as he was seen in the cipher).

Albert usually tends to be gentle, mature, and relaxed, but desired to make a world in which humans and Reploids may reach "evolution's extreme"; however, he comes to understand that humans and Reploids are incurably flawed, leading to "emptiness and misery" and evolutionary stagnation. So he decides to take it upon himself as the creator of the current iteration of the world and self-proclaimed "supreme being" to cleanse it of its deficiencies by destroying both, causing the world to "reset" in order to restore balance to its imperfect state. After this, Albert plans "to bring new life into the world" to replace humanoids "and protect its future."

He is a smart, calm, and intelligent man, but at the same time, insane. He was the "certain man who created Model W" that Prairie mentioned. He acts rather indifferent to his "son" Grey, constantly calling him a "defective," whilst he is more sympathetic towards Ashe, showing her far more respect (even expressing some regret towards having to kill Ashe prior to their battle as she was his flesh and blood). In addition, he also possessed delusions of godhood, as evidenced by his statements shortly before fighting Ashe and Grey for the final time. However, he does acknowledge their abilities after his defeat, but at same time curses them to "rot" in their earned peace.