Boulder

Boulder was a skinny gray tom.

Into the Wild
He was a friend and follower of Brokentail. Later, he was exiled with Brokentail, Blackstar, and Clawface.

A Dangerous Path
When Tigerstar became leader, Boulder was brought back into ShadowClan.

The Darkest Hour
In the prologue of The Darkest Hour, he and Tigerstar went into BloodClan territory so Tigerstar could meet Scourge. When Scourge killed Tigerstar, Jaggedtooth joined BloodClan, and Boulder thought it was worth betraying BloodClan so he could get his claws in Jaggedtooth's fur. He fought alongside LionClan (the four Clans combined, led by Firestar) to fight BloodClan.

Firestar's Quest
Coming Soon

Midnight
Coming Soon

Moonrise
Coming Soon

Dawn
In The New Prophecy, he was an elder. However, he didn't appear in the allegiances until Dawn.

Starlight
Coming Soon

Twilight
Coming Soon

Sunset
He didn't appear in the allegiances in The Sight, leading to the fact that he might have died in the six moons between Sunset and The Sight.