Bailey O'Neill

Bailey O'Neill is a 17-year-old high school student, Burger Shack employee, and Omnitrix user.

History
Bailey O'Neill was born in a timeline where a rogue Galvanic Mechamorph named Omega laid waste on Earth. He and his friend, Alanha Duran, were one of the few survivors left, hiding from the unstable Mechamorph. He was told stories by Alahna's father, "Alan", who was eventually killed at the hands of Omega when he was 4 years old. His father, Marcus O'Neill, being Azmuth's assistant, took it upon himself to scavenge one of the few remaining Omnitrix cores on Earth, as those were the source of Omega's power and strength. Marcus, with the assistance of some others including Jan Winriter, would create an Omnitrix prototype for his son. Bailey just turned 16 years old when he received the prototype Omnitrix from his father, which would've served as a means to fight back against Omega, but after he and the others set out to stop Omega, it was all for naught. The Mechamorph couldn't be stopped with all of the Omnitrix cores he had consumed and they had ultimately lost the battle. Some of those that tried to fight back were killed. When all seemed hopeless initially, Marcus would start constructing a machine that would send Bailey and Alahna to another timeline in hopes that they would escape the crazed Mechamorph. Alahna left first, but Bailey would meet his father one last time, exhanging goodbyes and saying last words. Marcus gave Bailey his crystal necklace to "keep him and his family in memory" before the teenager escaped through the machine.

Present
Bailey found himself in Undertown after escaping to Bio's timeline when he came across an android named Otis, who was willing to help him find a place to live in. He is now attending Bellwood High School, working a part-time job at Burger Shack, and currently residing in Undertown with Otis. Over the weeks since he arrived here, he has gained some new friends and allies (and enemies). He is now involved in a Time War with two sides: Team Tennyson versus the Devoted - Bailey being part of the former. He is also tied up with the recent events involving the sudden appearance of Omega. He had thought he escaped from the Mechamorph and is now more determined to put a stop at Omega's goals.