The Forgotten Warrior is the first book of the The Omen of the Stars arc. The author is Cherith Baldry, and it was published on November 22nd, 2011. The book is written from the point of view of 5 cats; Jayfeather, Ivypool, Dovewing, Lionblaze, and Hollyleaf.

As a full-scale battle with the Dark Forest looms near, tensions between the warrior clans are high, while spies within the clans work for the Dark Forest.

Ivypool, a young warrior of ThunderClan, is one of these spies, and is training in the Dark Forest, with clan cats and even other clan-mates, and her role of the spy continues to become dangerous every day.

Soon, Sol returns, and does not deny that he had saved Poppyfrost's kits. He is welcomed, but not trusted by the Senior warriors.

Dovewing, Ivypool's sister, is haunted by dreams of the mountains. Dovewing and Ivypool are sent to find Sol, to find out if he betrayed them to WindClan. During their serach, they are nearly found out by a WindClan patrol, until they meet Hollyleaf.

Hollyleaf introduces herself, and tells ThunderClan the truth of Ashfurs death, and also who actually saved the kits, and prepares the ThunderClan cats for battle.

Jayfeather he is told by Yellowfang to tell Cinderheart, the reincarnation of Cinderpelt, who she was in her past life. However, Leafpool tells him that Spottedleaf says they should keep quiet about it.

Lionblaze is disappointed that Cinderheart believes they cannot be mates because of the prophesy, and explains this to Jayfeather after remembering her past life, and feels she should be Medicine cat again.

With the Dark Forest battle on the horizon, will the clans work together? Or fall into distrust?

The Great Clans were Clans consisting of large felines, such as leopards, tigers, and lions, living freely in the wild. They are regarded as the ancestors of all cats, both Clanborn and kittypet, with legends attributing the different great cat species with having given the cats the different traits they now possess.

The Great Clans are the three Clans the modern Clans have descended from.

• LionClan had flowing manes, like the rays of the sun. They were massive cats with golden pelts and manes, who were strong and brave. They were considered to be most like ThunderClan. Comprised of lions, LionClan is the subject of many Clan myths and legends.
• LeopardClan were swift, agile cats with golden pelts and black spots, who were swift and sure. They were considered to be most like both WindClan and RiverClan. It was consisted of leopards who were the swiftest of the great cats. They are huge and golden, spotted with black pawprints. All cats possess their speed and hunting talent from LeopardClan.
• TigerClan were flame-colored night hunters, with black stripes like shadows flickering across their fur and the darkness of night in their souls.

Jake is a plump, ginger tom who is a kittypet as well as the father of both Scourge and Firestar and can be found curiously roaming the forest often. Sitting on a fence, Jake introduces himself to Bluepaw as she is hunting and asks a tirade of questions, but their meeting ends up being cut short though Jake invites her to join him in his nest the next time they meet. As life goes on, Jake meets with Pinestar and, after some inquiry, informs him of the kittypet life.

When Quince, one of Jake's mates, observes a photograph of Jake, she notes that it's odd that his three children with her, Ruby, Socks, and Tiny, did not inherit his ginger fur, but nevertheless still have the same spirit.

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