This is a Champions Universe timeline I compiled for a friend, based on the one in Champions Universe (6th edition) but hewing a little closer to the Champions Online timeline, with references to most characters who aren't in the game omitted.
For a much more detailed timeline, consult Champions Universe (6th edition), which I cannot recommend strongly enough. This is but a small taste of the richness of the world that Steve and many others have created.
Note that in the CO Universe, history unfolds as it does in our timeline, with minimal variation for the presence of superhumans. Also, some legendary places and personages such as Camelot, Sherlock Holmes, and Dr. Jeckyll (ie. fictional characters in the public domain) are real in the Champions timeline.
This timeline is subject to change by Cryptic (who has and continues to make alterations).
c. 2,000,000 BC
The alien Progenitors seed the ancestors of the human race and jumpstart its evolution.
c. 500,000 BC
The Progenitors' experiments result in the creation of the Empyreans, a superhuman race.
Battle of the Coreward Fields turns the Malvan-Elder Worm war in the favor of the Malvans. Some Elder Worms make their way to Earth.
c. 70,000 BC Birth of Evil. Kul-Tarak, who later becomes Takofanes, is born.
Lemuria founded by a scientist-sorcerer.
The Lemurians attack the Empyreans with the Mandragalore, a powerful magical weapon. It backfires and Lemuria sinks.
c. 35,000 BC
The snake-god Nama is born in West Africa.
c. 32,000 BC
Rise of Atlantis.
c. 30,598 BC
Sharna-Gorak the Destroyer causes the destruction of Atlantis.
Lemurian sorcerers create the Bronze King to turn the tide in a Lemurian civil war.
In the Lynx's Fold of what's now Northern Canada, the spirit of the Land, aided by human shamans, defeats the spirit of the Ice. The Ice Age ends, bringing in the start of the modern age. The Inuit god Kigatilik, who sided with Ice over Land, is cast out of that pantheon. He becomes an agent of the Ice, seeking vengeance on the shamans who opposed them.
c. 30 AD
The death of the prophet Yeshua (commonly known as Jesus) enforces a Ban against old pantheons directly interfering in the fate of Earth.
c. 520 AD
Sir Giles de Morphant, a black knight in the days of King Arthur, is slain by Lancelot. He is later revived as the supervillain Black Paladin.
c. 1000 AD
Viperia is born in Africa. At the behest of local tribes, Nama places her in suspended animation to avoid the continental destruction.
Vlad Tepes is transformed by magic into Dracula.
The first Black Mask is born.
The Circle of the Scarlet Moon is founded by decadent French nobles.
The Empyrean Arvad leads a rebellion against King Hazor, but is defeated and exiled.
c. 1800 AD
The Trismegistus Council is founded to serve as guardians of white magic.
An American secret society known as the Patriot Lodges (aka the Hunter-Patriots) launch an invasion of Canada, to fulfill a vow to overthrow British influence in North America, launch an invasion in Canada. They're defeated, but not before swearing a mystical oath that their descendants would not abandon the cause of Republicanism and the struggle against the Crown.
Arvad uses his mental powers to seize control of Lemuria.
The Unholy Order of the Grand Reptile, the predecessor of VIPER, is founded in London.
The Empire Club, a staple of pulp adventurers until the Second World War, opens in New York City.
Vlad Tepes, aka Dracula, is killed by monster hunter Abraham Van Helsing. However, his father Vladic Dracul survives to lead many of the world's vampires into the coming age.
The Circle of the Scarlet Moon kills earth's Archmage. The earth goes without a major protector against occult threats for over a century.
Birth of Albert Zerstoiten, the future Doctor Destroyer.
DEMON is founded, committing the "Dog Day Murders" in New York City.
After the murder of her father, Princess Mara becomes rightful queen of Atlantis. Unable to get her throne, she establishes herself as the mystery woman Sea Hawk.
1938 AD May 1. Birth of Modern Superhumans. A Nazi ritual attempts to endow a German cult with mystical powers. Instead, it unlocks the ambient magical powers of earth, greatly increasing the influence of magic and making superpowers possible. The first superhumans are born: Der Sturmvogel in Germany, Captain Patriot in America.
The Sirians, an alien race, invades New Jersey. Four superhumans respond. After their victory, they found the Defenders of Justice, the world's first superteam.
Pulp adventurer, tycoon, and scoundrel, Edgar Lancelyn Essec falls under the spell of Nama while exploring a cave in West Africa.
In the wake of the Pearl Harbor attack, American superhumans volunteer for war, The Defenders of Justice are among the first volunteers. The US Army sets up a secret supersoldier project in Haynesville Kansas, where Captain Patriot was created.
Lemuria joins the Axis side in the war. They attempt to invade California, but are repulsed by a team of heroes called the Justice Squadron.
The Defenders of Justice help Mara recapture the throne of Atlantis.
Albert Zerstoiten betrays the Nazis and flees to South America.
Brought together by Nama, thirty men and women, survivors and sympathizers of the Axis cause and the Unholy Order of the Grand Reptile, found VIPER, swearing an oath on the Serpent Lantern.
First appearance of Vanguard, the world's most powerful superhero.
1962 AD August 22. "Green Monday". VIPER makes its first public appearance, performing numerous targeted assassinations around the globe. The United Nations sets up a tribunal on international law as a response.
*The supervillain Revenger conquers the Selenites, the Moon people, and uses them as tools in his plan to conquer humanity.
Kigatilik, imprisoned centuries ago by the Inuit gods, is freed. The Land empowers four people, the Mighty Canadians, in response (Celestar, Kivioq, Timberline, and Bonne Vivian).
The first Qularr invasion nearly destroys Tokyo.
UNTIL is founded. The US refuses to recognize them or let them operate on American soil.
DEMON makes its first modern appearance, stealing the Basilisk Orb and performing a ritual on the Caroline Islands. They are stopped by UNTIL.
The Star*Guard, a group of galactic police, build a base on Europa and send a representative to Earth.
First appearance of the All-American, a super-soldier created by the Perseus Project, an offshoot of the research done by the Haynesville Project in WW2.
Superheroes defeat the Revenger and frees the Selenites from his control. Revenger dies in a cave-in.
Lewis Frey, aka Masquerade I, is captured by Black Mask. He spends the next fourteen years in prison.
1975 AD Destroyer Walks the Earth. First appearance of Dr. Destroyer, as his attempted conquest of California is barely defeated.
The Mighty Canadians' final battle. They seal Kigatilik in the Frost Tomb, but all of their members except Celestar are sealed with him.
The first Gadroon invasion is foiled by an alliance of Earth superhumans, including Dr. Destroyer.
Stronghold is built in the American southwest.
An accident involving a "delta bomb" transforms White Sands New Mexico into Burning Sands.
Dr. Destroyer allies with VIPER, but it's a ruse to allow Destroyer to get control of the Serpent Lantern. In the end, both sides lose the Lantern.
First appearance of the Slug.
ARGENT is founded.
Prompted by the deprivations of Dr. Destroyer, the United States passes the first superhuman registration act.
*The Institute for Human Advancement (IHA), an anti-mutant organization is founded.
ARGENT is exposed as a criminal organization. Their lawyers keep them in business, but their leaders flee the country, eventually relocating in the middle eastern nation of Awad.
Disaffected Danish politician Danar Nicole quits the European parliament, eventually founding the villain team Eurostar.
1984 AD March 30- June 24: Reign of the Destroyer. Using mind control satellites, Dr. Destroyer seizes control of the globe. He is defeated by Vanguard and his island base, Destruga I, is destroyed.
1985 AD The Machine Starts. First appearance of Mechanon.
Dr. Silverback is rescued from the clutches of Moreau.