Captain Britain's History
Born in the small town of Malden, Essex, Brian was a graduate student in physics, in advance of his years, at England's Thames University. Working under his mentor Dr Travis at the Darkmoor Research Centre during the holidays, he was present when the mercenary Reaver and his men raided the facility to kidnap the scientists there. Escaping with the intention to get help, Brian fled on a motorbike, but was run off the road.
Bleeding to death, Brian was approached by Merlin and his daughter Roma, who told him that he could live if he became Britain's next great champion. They offered Brian a choice: The Amulet of Right (or Life) or the Sword of Might (or Death). Being a scholar and not conceiving of himself as a warrior, Brian chose the Amulet.
He then became Captain Britain, complete with costume and super-powers, as well as a staff, which was later replaced by Merlin with a 'Star Sceptre' that enabled him to fly. Moments later, the Reaver arrived and, claiming the sword, was transformed into an armoured knight with tremendous strength. Captain Britain nonetheless defeated him, meeting his first challenge as a hero with courage and surprising skill.
Over the next few months, Brian battled such foes as the Vixen, Hurricane, the Mastermind computer, Lord Hawk, Doctor Claw, Dr. Synne, the Highwayman, Basil Crushstone AKA the Manipulator, the Lurker from Loch Ness, Nykonn, the Black Baron and the assassin Slaymaster as well as teaming up with Captain America against the Red Skull. His activities made him popular with the public, though he was considered a vigilante by the police, in particular Chief Inspector Dai Thomas, who dedicated himself to capturing and unmasking Captain Britain. Thomas's subordinate, Detective Inspector Kate Fraser, was more sympathetic to the novice hero.
Eventually, Brian came to America on a study abroad program. By a strange twist of fate, he ended up rooming with Peter Parker at Empire State University. Parker also had a secret identity, namely Spider-Man, and after battling the assassin Arcade together, the two began meeting for nightly patrols and training; Peter quickly deduced that his English roommate was also the new English hero in town, but Brian remained unaware that Spider-Man was his roommate. Brian began to drink heavily, and it affected his performance both as a student and as a hero, but soon stopped after inadvertently inflicting serious injuries on an opponent because he had fought them in an inebriated state.
Otherworld Quest and the Black Knight
Returning to Britain, Brian was subjected to a psychic attack while travelling on a plane over the English Channel. He jumped from the plane and was washed ashore on the coast of Cornwall, where he lived for some months as an amnesiac hermit until he was found by Dane Whitman, the Black Knight, who restored his memories and accompanied him to Otherworld to save Camelot from the evil Mordred and the demon lord Necromon at the behest of Merlin. During the course of this adventure, Brian died but was resurrected by Merlin. Also at some point during this period, Captain Britain and the Black Knight were both briefly abducted by the Grandmaster to participate in his 'Contest of Champions', but were subsequently apparently returned to their former place and time with no memory of the event.
The Jaspers Saga
Once this mission was completed, Captain Britain and an elf named Jackdaw were apparently sent home by Merlin, but accidentally ended up on a parallel Earth (after colliding with the Time traveler Ralf in the void) where they met the mysterious Saturnyne and fought the insane mutant Mad Jim Jaspers. Jackdaw and Brian were both killed by the cyborg monster called The Fury, but Brian was resurrected by Merlin again, this time on his own Earth, where he and a number of others including his sister Betsy, the dimensionally displaced Captain UK, Saturnyne and the alien mercenaries known as the Special Executive successfully defeated both the Fury and Earth 616's version of Jaspers (the other version, and his entire dimension, were later erased from existence by the Dimensional Development Court). Merlin was seemingly killed in the final battle, but later returned.
Later solo adventures and Excalibur
Some time later, Brian gave up the Captain Britain identity, allowing his sister Betsy to take up the mantle. Unfortunately, Betsy was unprepared to be Captain Britain, and lost her eyes in a battle with Slaymaster. Brian felt his twin's pain through her telepathy and a special bond they share, and rushed back to fight Slaymaster, whom he then killed. Brian then resumed the mantle of Captain Britain, and fought evil as Britain's premier superhero.
Then, when the X-Men appeared to die in Dallas (see Fall of the Mutants), Brian was disconsolate over his sister's death. He drank heavily, and scared away his lover Meggan, who went to find Nightcrawler, an acquaintance of hers on Muir Island. Meggan arrived at the same time as the Technet, an interdimensional band of mercenaries who were looking for Phoenix. When Meggan and Shadowcat were captured by the Technet, Nightcrawler went to enlist Captain Britain's aid. However, Kurt found Brian deep in a drunken stupor, completely depressed and uninterested in doing anything anymore. So Nightcrawler pitched Brian over the edge of his lighthouse's balcony and into the ocean. When Brian recovered and flew back, Nightcrawler convinced him to help him find the women. At the successful conclusion of that mission, Cap joined with the other mutants to form Excalibur, Britain's premier superteam.
When Phoenix abruptly rushed to America when New York was engulfed in the Inferno, Excalibur followed. After his costume was destroyed, Captain Britain discovered that his powers were linked to Britain, and would diminish if he left he country for too long. This weakness was partially alleviated when Excalibur went dimension-hopping during the Cross-Time Caper when Captain Britain received the magical costume of Captain Marshall (the Captain Britain of that world) which acted as a battery for his arcane power.
Months later, Brian suddenly began to grow larger as his body absorbed more and more energy as different realities came into alignment, heralding a Cosmic Convergence. The team learned that Necrom was planning to use the convergence to become omnipotent, but using Shadowcat's powers the team merged into Brian's enormous body and fixed the damage Necrom was doing across the multiverse. Then, on Roma's secret cue, Meggan drained Brian of all his excess energy, returning him to normal size, and fired it at the tower which was the linchpin through all the dimensions of the multiverse.
Brian and Meggan took some time off from the team and got engaged, but they and the rest of Excalibur were soon captured by the R.C.X. and Brian was severely beaten when he resisted. Dying, broken and bloody, he was healed by Roma, who fixed the arcane circuitry in his costume to match his body's frequencies, and who also removed a "blunder factor" she had cast over him, ensuring that he would need the help of a team until he saw the innate value in it.
Immediately afterwards, Phoenix reappeared and Excalibur journeyed to the future to save it from the Sentinels. Unfortunately, on the way back Brian was lost in the timestream. No one had a clue how to find him until his body parts started appearing in the same space as Rachel's, first his arms, then his chest, for brief flickers. Meggan confronted Rachel about Brian's whereabouts and with Daytripper's help they opened a rift in which Brian and Rachel switched places. Rachel was flung to the far future to become the Mother Askani, and Brian returned home. However, he was flooded with memories of the far future and seemed disconnected for the real world.
He called himself Britanic for some time, but eventually re-acclimated himself to his old life.
After receiving a message of impending danger from Jean Grey, who had found Alistaire Stuart running from Black Air, and one from Shinobi Shaw regarding Mountjoy's infiltration into the London Hellfire Club, Brian went to the Club and claimed his father's position as Black Bishop, defeating the contender for Red Bishop with one punch. When Black Air and the Club made their move, Brian was attacked by the Black Queen and Scribe, who was possessed by Mountjoy. Luckily, Brian was in his newly-refurbished costume, complete with projectable forcefield, and he defeated them both.
He appeared to have come to terms with both his scientific and superhero sides. Soon afterwards, however, in a battle with the Dragons of the Crimson Dawn, Brian expended all of his power to stop a dimensional portal from opening. He left the team for a while, but returned to fulfill his dream of marrying Meggan. At the ceremony on Otherworld, the rest of the team decided to return to the States, so Excalibur disbanded, leaving Captain Britain and Meggan as Britain's foremost heroes.
King of Otherworld
Brian soon went back to work at the Darkmoor research facility, and it was during one of his tests (on the new blade and armor of his friend the Black Knight) that Widget reappeared with warriors who attacked him and Meggan, tracking Captain U.K. stating that Roma ordered it done.
The heroes (including Psylocke, who was also visting in England) drove the attackers off, then followed them to Otherworld, where they discovered that that Captain Britain Corps had been decimated. Together with the survivors, Crusader X and Captain U.K., Brian and his comrades had to stop Roma, using his troop who revealed to be the R.C.X. Warpies and Cherubims tortured and modified as soldiers, from acquiring the Sword of Might, Excalibur, which together with the Amulet of Right (which had returned to Otherworld when Brian lost his powers) could remake the cosmos. Brian went in search of the sword, and ended up finding a computer-filled shrine in a cavern built by his father.
A hologram of James Braddock, Sr. explained to Brian that he was the savior and rightful heir of Otherworld, and had the innate right to wield Excalibur. The hologram re-activated Brian's powers, and Brian drew the sword, which generated a fiery St. Andrew's Cross (from the British flag) as a mask on his face. Brian then confronted Roma, who was revealed to be his father's sentient and insane computer Mastermind, and defeated him together with the real Roma. Roma then relinquished control of Otherworld to Captain Britain, and he and Meggan remained in Otherworld as effectives rulers of the multiverse, with as first action their use of the Excalibur sword to restore the integrity and humanity of the warpies. Unbeknownst to Brian, the events leading up to his assumption of the Otherworld were orchestrated by Kang the Conqueror and Widget, for reasons yet to be revealed.
Lionheart of Avalon
Recently, Brian and Meggan appeared to Kelsey Leigh, a British mother who had died protecting her kids and Captain America from the Wrecking Crew with Captain America's own shield, and offered her the choice between the Amulet and the Sword, making her into a new Captain Britain upon her choice of Excalibur. Brian himself was captured by Morgan le Fay, who hoped to kill him, thereby destroying Britain via Brian's mystical connection with the land, but since his power was transferred to Kelsey, the plan failed.
After discussions with Doom and Namor, the Black Panther and his wife Storm tried to recruit Brian in their movement against the US Super-Human Registration Act.
He decline the proposition and was fustiged by Ororo for his attitude. Claiming the return of the Ebony Blade as part of the British legacy, but this was denied by T'Challa, as it was been used by a mercenary against him. (The Sword was later given back to Dane Whitman by Storm.
Captain Britain was forced to come back to Earth to stop the House of M reality from coming into existence. During this time, his wife Meggan apparently sacrificed her life to save a rip in time from destroying the Earth. This had resulted in Brian becoming active as Captain Britain again and the formation of the all new Excalibur, along with Pete Wisdom, Sage, Juggernaut, Dazzler and Nocturne.
During the Secret Invasion Captain Britain and MI-13 believed that the Skrulls planned to invade Avalon through The Siege Perilous. In taking the magical realm of Avalon the Skrulls would control the Earth's magic. To keep this from happening Brian tried to stop a Skrull nuclear missile head on by sacrificing himself. As British military, MI-6 and Avalon where making their last stand Merlin resurrected Braddock. Immediately Brian entered Avalon and pulled out Excalibur from the stone. Upon arriving at Brittan’s last line of defense attacked the Super-Skrull Commander. After the battle going in favor of both sides Brian threw the final blow. At the same moment Satannish, who had given Wisdom one wish in exchange for letting him free on Earth, destroyed all Skrulls in the British Isles and any that have and will try to enter.
Captain Britain & MI-13
Following the events of the Skrull invasion, as the new members of MI-13 attempted to adjust and Brian began to grasp how his new powers worked, they were sent to assist Captain Midlands, who was investigating one of the threats that Pete Wisdom had unleashed to defeat the Skrulls, Plokta. MI13 later went on to defeat the vampire lord Dracula's attempt at subjugating Britain, and are currently Britain's first line of defence, with Captain Britain and the now recovered Meggan firmly at the heart of the team.
Joining the Earth's Mightiest Heroes
During an international meeting between Commander Rogers and MI13, Captain Britain was offered a job with the Avengers. Captain Britain accepted despite mixed reactions from his MI13 teammates. In first, he was consider like a reserve member, but later, he was choice as officially a new member of the secret team of the Avengers.
The Trial of Fantomex
Otherworld came under attack by a mysterious force, led by a Goat-Demon, who revealed later to be an aspect of his brother's personality, Jamie Braddock.
Sharing Psylocke's memories during X-Force's confrontation against Archangel, thanks to their siblings links, he saw the murder of the Apocalypse boy by Fantomex and organized his abduction, leading a Captain Britain Corps' commando.
He also abducted Psylocke to made her again a member of the Corps, to defend Otherworld.
Brian intended to make Fantomex pay for his crime, but also to wipe him off the Multiverse, seeing as an unique and dangerous anomaly (although we know a few alternate, but all from the future).
When Psylocke finally discovered the identity of the invader, she ordered Brian to kill Jamie, and facing his hesitation, she take the control of his body and made him kill his older brother
Avengers vs. X-Men
When it was revealed that the Phoenix was heading towards Earth, Braddock was a member of the team led by Thor to stop it.
Age of Ultron
During Ultron's sudden take over of Earth, Brian fought the robot's sentinels along Captain Marvel. But both Captains ultimately perished.