Jonothon Evan Starsmore ("Jono" to his friends) is a native of London and a mutant who possesses a furnace of psionic energy in his chest.

[citation needed] This is further supported by the fact that Jono is immune to the "Death Factor" of Omega Red, meaning that he is not sustained by "life force".

[volume & issue needed] Shortly after his mutant powers manifested, Jonothon accepted an invitation to join Xavier's School for Gifted Youngsters.

[volume & issue needed] Jono's greatest victory during the time he was with Generation X was when Banshee was attacked by the mutant serial killer Omega Red.

Chamber was the one student to be offered a place on the X-Men by Charles Xavier,[9] but apparently failed to join the group when expected.

[volume & issue needed] After failing to join the X-Men, Chamber returned to London, where he hooked up with pop star Sugar Kane, creating a publicity blitz for the singer, but she and Chamber parted company after her manager staged her abduction by anti-mutant forces following a phony tabloid story about her pregnancy by Jono.

He remained on the team for some time, but often showed frustration with being treated as a junior member by his teammates, even after playing a role in the defeat of Vanisher and Mystique's Brotherhood of Mutants when they infiltrated Banshee's X-Corps.

[volume & issue needed] Following a strained time on the X-Men, Chamber investigated the apparent murders of mutant students at Empire State University[10] on their behalf.

However, he is abducted and healed by Clan Akkaba member Frederick Slade and transformed into a grey-skinned form resembling his distant ancestor Apocalypse.

Now once again in possession of a gaping hole in his chest and jaw, Jono submitted to observation by the X-Men's resident biologist, Dr. Kavita Rao.

[22] When the school moves and reforms in Central Park, New York City, Chamber becomes a teacher there before being killed by Harpoon of the Marauders.

They were eventually made to transport Deathbird to Chandilar to be Majestrix Xandra Neramani's teacher, avoiding an assassination attempt by Oracle[26] He was later seen working with Nightcrawler's Legionaries.

[27] Jono's thoracic and abdominal cavities are a chamber for a furnace of psionic energy capable of nuclear fission whose output can be projected as wide blasts of concussive force or laser-like focused beams that disrupt atomic bonds.

Chamber requires no food or oxygen and is seemingly indestructible as he has disintegrated his own body along with D'spayre's down to their sub-atomic components in a kamikaze attack and later reconstituted himself.

[28] His bizarre physiology suggests he is actually a being of pure psionic energy inhabiting a dead organic shell that he can disintegrate and reassemble from memory, a hypothesis several characters have put forward in comics.

After being depowered by the events of House of M, Jono's body was rebuilt by Clan Akkaba in the image of Apocalypse and he later employed technology to mimic sonic powers as Decibel.

This version is the leader of Generation X whose body remains intact due to him receiving a cybernetic chest plate that regulates his powers.

[32] An alternate universe variant of Chamber from Earth-13729 appears in Doctor Strange and the Sorcerers Supreme #10 and Uncanny X-Men: Winters End #1.