Ratchet & Clank: All 4 One is a four-player cooperative video game developed by Insomniac Games and published by Sony Computer Entertainment exclusively for the PlayStation 3 which was released on October 18, 2011 in North America and October 20–October 21 in Europe and Australia. It is the tenth installment in the Ratchet & Clank series. It is the first PS3 game in the series that, despite taking place after A Crack in Time, is not part of the Future trilogy. It was announced by Insomniac CEO Ted Price during Sony's press conference at Gamescom 2010. This also has a online mini game called 8 bit Mini Mayhem where you only play as the four main characters with Mr Zurkon.
The game begins when Galactic President Captain Qwark goes to the city of Luminopolis to receive an "Intergalactic Tool of Justice Award", and he asks Ratchet and Clank to escort him. When the ceremony begins, Dr. Nefarious arrives and awakens a light-eating Z'Grute from cyrosleep, but it immediately turns against him, forcing Dr. Nefarious to join Ratchet, Clank and Qwark to stop it. While the team tracks the Z'Grute, strange unidentified robots follow the Z'Grute that don't seem to belong to Nefarious. After the team defeats the Z'Grute, a massive moon-sized drone appears and captures both the Z'Grute and the four heroes. They then awake in a mysterious facility but are rescued by Susie, a young galactic scout. When the team escapes and arrives at a Tharpod village, they find out that the drone that captured them is known as Ephemeris, the Creature Collector. It takes the universe's most dangerous beasts and brings them to planet Magnus. The team agrees to get rid of Ephemeris and heads through the Deadgrove to the N.E.S.T. (Northern Extraterrestrial Sorting Terminal). After fighting a Wigwump, the team finds the fifth holo-diary of Dr. Frumpus Croid. It shows that whoever is now in control of Ephemeris has plans for the monsters.
After fighting Commander Spog at the N.E.S.T, they find out that only the Architect knows how to defeat Ephemeris and head over to Terawatt Forest, beyond Octonok Cay. They also find Dr Croid's first holo-dairy. It shows the happier times on Magnus. While in Octonok Cay, they find Dr. Croid's next two holo-diaries. They show that Dr Nevo Binkelmiyer, Dr Croid's colleague betrayed him, ravaged his laboratory, took Mr Dinkles, Dr Croid's companion and stole the plans to a protomorphic energy extracter and that Dr. Croid sent a smaller version of Ephemeris to rescue his companion, Mr. Dinkles. When they reach Dr Croid's research station, they find Dr Croid's fourth holo-dairy. It shows that Nevo seized control of Ephemeris and modified it into what it is now, and that Nevo is responsible for everything Ephemeris has done. When the team reaches the Hall of Paradoxology in Terawatt Forest, they find that Dr. Croid has moved his laboratory to the Phonica Moon, having expected Nevo to make an assassination attempt on him. When the team reaches Phonica Moon, they realize that Dr. Croid has seemingly gone insane. After accessing the lab's computers, Nefarious discovers that Ephemeris has a charging dock that recharges its power cells, the dock being stationed on the Vilerog Plateau just outside Uzo City. The team takes Dr. Croid's escape pod to the Vilerog Plateau, but on the way, Ephemeris attacks them and they crash land into the Polar Sea, unable to contact Cronk and Zephyr. When they discover a railway station, they find that it is broken. Qwark fakes dying, attempting to make amends with Nefarious. Just then, the plumber appears and fixes the railway platform so the heroes can travel to Uzo City.
When the team reaches the core of Ephemeris, they discover that Nevo is not actually in charge of Ephemeris, having been betrayed by Mr. Dinkles, who is possessed by a Toranux Spirit. He reveals that Nevo did not betray Dr Croid. Mr Dinkles had done the things Dr Croid thought Nevo had done. Although Nevo tried to stop Mr Dinkles, Mr Dinkles captured Nevo and made him his "pet". He will also use the collected beasts as vessels for the Toranux Spirits so they can destroy the universe. After fighting the heroes, he extracts his spirit into a Rykan V Grivelnox. After a long and fierce final battle, Dr. Croid and Nevo manage to extract the spirit, which is promptly destroyed by Nefarious. Soon afterwards, Cronk and Zephyr arrive, revealing that they finally received help from Lawrence. Nefarious and Lawrence steal Cronk and Zephyr's ship and leave the heroes stranded on Magnus. Thankfully, Ratchet remembers that Ephemeris is still active, and everyone decides to use it so they can return to Luminopolis.
After the credits, Lawrence tells Nefarious of a secret route they can take past the barriers set by the Polaris Defense Force. During this, Nefarious looks at the picture he took with Ratchet, Clank, and Qwark.