The Five are Matthew Freeman, Pedro/Inti, Scott and Jamie Tyler (Flint and Sapling) and Scarlett Adams (Scar, or Lin Mo, the Chinese goddess of the sea).
The Old Ones ruled the world for eighty years at the dawn of humanity, but the Five defeated them, and threw them into Hell, causing the demons to await their return for millennia.
He did reappear in the third novel Nightrise, but only very briefly when Scott and Jamie Tyler appeared in the Nazca Desert, the place where Matt and Pedro were staying in Professor Chamber's hacienda.
In Necropolis, Matt enters the door in Tai Shan Temple in Hong Kong along with Lohan Shan-tung and arrive in Belem, Brazil ten years later, in Oblivion.
Having read his life book in the dreamworld library, Matt knows what he has to do, and tells Lohan that they need to head for Antarctica where the Old Ones hold a base called Oblivion.
He discovered that during the stay with his carer Sebastian in Ciudad del Veneno, known as Poison Town in English, none of the people around him got sick due to his healing abilities, and when Matt slept at the house where Pedro lived, he noticed his scars from a previous fight had vanished overnight.
Scarlett was found at an orphanage in Indonesia and was adopted by English parents named Paul and Vanessa Adams, who were respectively, an international business law specialist and the head of a holiday company that put together packages in China and the Far East.
In the second novel, Evil Star, Richard left his job as a journalist for the Greater Malling Gazette and worked on another newspaper, The Gipton Echo.
But in Necropolis, he makes a bigger appearance when he goes with Matt and Jamie to London to try to find Scarlett Adams, the last of the Five, and then goes to Hong Kong with them via Macau before they are attacked and separated.
However, due to the ten years that had passed because of the door's malfunction, the country is now engulfed in a civil war between the military government dominated by the Old Ones and a group of freedom fighters led and funded by the Nexus.
The Nexus is a highly secret group of powerful and influential people with some link to the supernatural world who prevent the Old Ones re-entering planet Earth.
However, in Raven's Gate one of them, Professor Sanjay Dravid, is killed by a pterosaur and in Evil Star, Fabian, another member of the Nexus, is shot by Captain Rodriguez of the Peruvian police service.
A black superintendent who appears solely in Raven's Gate, Mallory is in charge of interviewing Matthew Freeman after the police arrest him on suspicion of murder.
The next night, Jayne Deverill arranges for a phone call for Matt, and he is immensely disturbed to hear the dead farmer, Tom Burgess, on the other end.
Later, he flies a helicopter over the Nazca desert along with Pedro and Matt to find Salamanda's base and prevent the rise of the evil star and opening of the Old Ones' gate.
Alicia McGuire is a black woman with dark hair and she is involved with politics, being an advisor to Senator John Trelawney before her son Danny was kidnapped.
The test Han Shan Tung has in mind is a sword ladder- a series of razor sharp blades strung together on wires creating 19 steps up to a balcony.
White Lotus Society Triad member and son of Han Shan-tung, Lohan is responsible for saving Scarlett from the shape-changers and the Nightrise Corporation.
After leaving his base in Florida, he travelled south to Antarctica, where he nominates himself as leader of the World Army, a ragtag group of survivors with the sole aim of defeating the Old Ones.
However his time in charge of the World Army is not a success, and though meaning well, ends up killing half of his troops with a failed attack on the fortress where Chaos and the Old Ones are based.
The only Old One to make a physical appearance in this book is Chaos, who attempts to escape from Raven's Gate with the assistance of the witches of Lesser Malling and the human antagonist, Sir Michael Marsh.
Chaos, King of the Old Ones, has made his base in Antarctica in a massive stone-ice palace called Oblivion, and he has sent his armies of Old Ones out onto the world to kill and enslave people.
The human armies fight back with firepower but most of them are defeated and Chaos ensures that corrupt politicians and billionaire magnates get all the luxury and money and slaves they want.
Along with the witches of Lesser Malling (of whom he is the leader), he is planning to use nuclear power and black magic as well as Matt's blood to open Raven's Gate and release the Old Ones.
Chaos is able to fill the oceans with junk, and he had almost succeeded in eliminating humanity, reducing it down to ten thousand people by the time Jamie Tyler arrived.
Chaos gives power to billionaires and evil politicians and ensures the world becomes worse, with the return of slavery, public murder and war.
Salamanda's main purpose is to get the diary belonging to St Joseph of Córdoba, because he knows this will gain him supernatural powers, and he auctions for it in London and pays an enormous sum of money to tempt William Morton, the book owner.
Mortlake is the woman who organized the attempt to kidnap Jamie and Scott, which half-failed, so she ordered one of their attackers, Colton Banes, to strangle his partner Kyle Hovey.
He also mentions that the late Nightrise agent Diego Salamander used his satellite to open the gate in the Nazca Desert, and how the Five have been reborn on the other side of time, and that the Old Ones have built Fortress Oblivion, in Antarctica.
The next time the new chairman appears is at Oblivion, where he reveals to Scott the Old Ones' plan to capture Matt, following the events of Evil Star, where he wounded the King of the Old Ones.