|"That's right. You could have killed us, but you chose not to. If that's what it means to live by your warrior code—that, and the fact you feed yourselves, and find your own shelter—then we want to be part of it."|
|— Boulder to Cedarstar in Yellowfang's Secret, page 144|
In the Super Editions
- When Yellowpaw and Raggedpelt come to Twolegplace to search for Raggedpelt's father, they are taken to a group of kittypets deep in Twolegplace. Yellowpaw introduces herself and Raggedpelt, and states that they are from ShadowClan. A black she-cat says that she has never heard of it, but a gray tom pads forward to sniff their pelts. He comments that they do smell of forest. Jay snarls at him, revealing that he is named Boulder. Boulder retorts at Jay, saying that he wonders what it was like in the forest.
- Boulder is part of the group of kittypets confronted by ShadowClan warriors, seen jumping over the fence to join Red and a tabby tom. Yellowfang sees him battling Rowanberry, blood trickling from a torn ear.
- Three sunrises later, Nettlespot and Toadskip lead Boulder and Red into the camp. When Cedarstar asks why they had come, they announce that they wish to join ShadowClan. Boulder steps forward and tells them that they wish to hunt and fight. As he does, some cats don't believe him. He bursts out saying that they catch their own prey, but is cut off by Red. He adds onto what Red says about how their Clan has strength and skill, but also mercy, that if that is what it means to live by the warrior code, they want to be a part of it. Cedarstar allows them to stay, though waiting a moon for them to prove their loyalty first.
- At twilight, Yellowfang spots the large tom and Red sharing a vole together. Boulder pads up to her, recognizing her as one of the cats that came to visit Hal. She admits that she was, though Boulder and Red cheerfully agree to keep quiet about it.
- The next morning, Cedarstar has decided to let Boulder and Red train as apprentices, despite what he had said before. Boulder interrupts the ceremony to many cats' shock, asking if he can keep his name. Cedarstar grudgingly allows him to, assigning him Mousewing as his mentor.
- Boulder participates in a training session with Yellowfang, Rowanberry, and the other apprentices in a training session overseen by Brackenfoot. They practice against Yellowfang, and win when Boulder sweeps Yellowfang to the ground and pins her down. They try again, and Yellowfang wins when she drops on Boulder as he tries to dive on her. Boulder and Russetpaw practice against Foxpaw and Wolfpaw while Yellowfang and Rowanberry rest.
- Boulder drops off prey at the fresh-kill pile with his mentor. At Foxpaw and Wolfpaw's warrior ceremony, he is seen near the front with gleaming eyes, as Yellowfang realizes that this is their first warrior ceremony that they had seen. He joins in enthusiastically with the calling of their new warrior names, causing Amberleaf and Finchflight to comment on how well the two cats are settling into the Clan.
- Yellowfang mentions Boulder and Russetpaw while talking to Hollyflower while out on a patrol. When Hollyflower says that kittypets hardly seems like real cats, Yellowfang says that Boulder and Russetpaw are real cats, and Hollyflower replies that she'd be surprised if they even remember living in Twolegplace. During a confrontation with Marmalade, Hollyflower mentions Boulder and Russetpaw, and when Marmalade asks if they knew where the two are, she triumphantly tells him that they were part of ShadowClan now.
- Marmalade and a mixture of kittypets and rogues attack the ShadowClan camp, looking for Boulder and Russetpaw. Yellowfang dashes outside the camp to find them, as they are out on patrol. She finds them with Deerleap and Frogtail. When Boulder and Russetpaw see that Hal is dead, they exchange a horrified glance, before being sent back to the camp by Raggedpelt. Boulder protests that the warrior code says not to kill, but Raggedpelt interrupts and tells him that Hal was outside the warrior code.
- Cedarstar tells Boulder to tell the Twolegplace cats why they were there, and he says that they wanted to see what forest life was like, adding that it was good. Pixie pads up to the two afterwards, saying they'd always be welcome back, but Boulder tells her that they were warriors now.
- Boulder and Russetpaw have their warrior ceremony. Cedarstar asks Mousewing if Boulder was ready to be a warrior, and he responds that he is a true ShadowClan cat. Though he knows Boulder doesn't want to change his name, he tells him that StarClan will see him as a warrior by what he does rather than what he is called.
- During the walk to a Gathering, Brokenpaw runs towards the ThunderClan side of the border, checking. After he is called back, Boulder comments that he will be a great warrior.
- Boulder mourns Cedarstar's death, thanking him for the chance to become a warrior and that he and Russetfur would never forget his generosity.
- Boulder is present at Brokenpaw's warrior ceremony, and is seen hurrying through the brambles. Once the ceremony is over, he gives Brokentail a friendly cuff on his shoulder, saying he was welcome on his patrols. He is sent staggering by Brokentail's return cuff, agreeing that they'd shred any enemies.
- Boulder goes to Yellowfang when he gets a thorn in his paw, talking about how good a warrior Brokentail is while she gets it out of his paw. He admits that he was a bit keen on chasing a blackbird, and ended up in a thornbush. She asks him if he caught it, and he responds yes, before saying that he'd better get back on patrol and dashes off.
- One night, he is out on a patrol. He is horrified when he sees that Raggedstar is dead, saying the patrol had fought with some WindClan cats, but they didn't know Raggedstar was hurt. He helps Scorchwind put Raggedstar on Brokentail's back to take him back to the camp.
- He goes to the medicine den after the battle that drives WindClan away, telling Scorchwind that he should have seen him fighting with the WindClan deputy. Yellowfang snaps at him to let her look at his savaged ear and to stay still.
- When Marigoldkit and Mintkit go missing, he is seen searching the camp, and is the first to notice Yellowfang return to the camp, and he stares at her.
In The Prophecies Begin arc
- Boulder does not formally appear in Into the Wild, but is listed in the allegiances. His apprentice is Wetpaw.
- Boulder does not formally appear in Fire and Ice, but is listed in the allegiances. Boulder has left ShadowClan, although it is not stated why. His apprentice, Wetpaw, has become a warrior named Wetfoot.
- Boulder does not formally appear in A Dangerous Path, but is listed in the allegiances. After spending time as a rogue, Boulder returns to ShadowClan, which is now under Tigerstar's leadership.
- In the prologue, he and Tigerstar go into BloodClan territory so Tigerstar can meet Scourge, the leader of BloodClan. Scourge and Tigerstar form an agreement, and BloodClan comes to the forest. When Scourge kills Tigerstar, Jaggedtooth joins BloodClan, and Boulder thinks it is worth betraying BloodClan so he can get his claws in Jaggedtooth's fur for betraying him. He fights alongside LionClan, the four Clans combined, led by Firestar, to fight BloodClan, then goes back to ShadowClan, now under Blackstar's leadership.
In The New Prophecy arc
- Boulder is now an elder of ShadowClan. When the Clans are deciding where to go, Blackstar says that they will travel to Twolegplace, BloodClan's former home, explaining that one of their elders, Boulder, used to be a member of BloodClan and can show the way and the best hunting places. The other Clans, however, disagree. When the Clans rescue ShadowClan from the Twoleg monsters, he does not respond to Leafpaw's greeting when she comes to check on him, but sighs softly as she pulls out a splinter in his flank.
In the Stand-Alone Manga
- He is seen with Tigerstar when he is taking him to see Scourge.
In the Tigerstar and Sasha arc
- He is introduced by Tigerstar to Sasha, a rogue, as one of his best fighters. A day after, Sasha comes to the ShadowClan camp, and he, Tigerstar, Oakfur, and Sasha go on a border patrol. Later, he is planning with Tigerstar and some other warriors near the end of the book.
In the Field Guides
- Boulder gives the tour of the ShadowClan forest camp. He talks about the boggy ground, prey and camps of ShadowClan. He takes the reader to the fresh-kill pile. He shows the reader a frog and says if you peel off the skin, it tastes as if rabbits and fish were mixed together. He also explains he was a loner before he met a ShadowClan warrior who tempted him into the life of the Clans, not mentioning his ties with BloodClan. He also rather threateningly adds that there is no reason to fear ShadowClan. Not all the time, anyway.
- Rock tells the kits of StarClan how Boulder was raised in BloodClan, but came to the forest when he heard of how much safer and easier the system of territories, warriors, and patrols sounded. He apparently had too much faith in the warrior code. He was the cat who led Tigerstar to Scourge with a desire to impress his new leader, without realizing that he knew from his time in BloodClan that Scourge would never help Tigerstar win a battle and then leave with the promise of some small hunting grounds. According to Rock, Boulder was not an evil cat. His ambition just got the better of him. He thought everything would work out as Tigerstar had planned, with BloodClan helping to take over the forest, and less cats would be hurt if the takeover was smoother.
- He lived a wretched life in BloodClan, and once he had heard about the forest, he decided to leave BloodClan to live there. He did want to impress his new leader, but he had forgotten about how Scourge could be. He thought that it was better to spill the blood of other cats than their own, especially cats who made his early life a misery.
- He is first mentioned on Russetfur's page to have come to ShadowClan with her.
- His own page is featured. He was born in Twolegplace. The first forest cats he saw were Yellowpaw and Raggedpelt when they came searching for Raggedpelt's father. He had fascination with the forest cats, and he participated in a fight with a ShadowClan patrol against some Twolegplace cats, sparking an interest in the warrior code. Cedarstar accepted him and Red into ShadowClan, and Boulder was mentored by Mousewing, though he kept his name. Boulder was a good warrior, and he supported Tigerstar, seeing him as an able leader for his Clan. He suggested meeting with BloodClan's leader, Scourge, but he trusted the cat too much, and Scourge murdered Tigerstar. Boulder fought hard against the BloodClan cats and remained loyal to ShadowClan.
- Boulder is last mentioned during Tigerclaw's leadership ceremony, where it is told that his support of Tigerclaw had helped him become Nightstar's successor.
- He is lastly mentioned, although not by name, on Scourge's and Bone's page. A former BloodClan cat came to Scourge with Tigerstar, asking for an alliance with the other Clans.
In the Novellas
- Tigerclaw notices Boulder, Fernshade, and Deerfoot on a patrol. Boulder approaches first, and informs them that Rowanberry told him she saw them, asking why they were there. It is noted that despite his bright eyes, Boulder's ribs show beneath his fur, and his flanks tuck with hunger. Tangleburr explains that they lived in the fallen oak, and Boulder asks if they were the cats that attacked ThunderClan. Once they bring some prey, Boulder lowers his head, sniffing the prey heap, and claims that it would fill the fresh-kill pile more than it had been for days prior. However, Boulder tenses, and reminds Tigerclaw that he said they would stay out of ShadowClan territory, and couldn't guarantee their Clanmates' reactions.
- Boulder then puts down a sparrow he carries, and explains that no cat had escaped sickness, and recommends for them to turn back in order to remain uninfected. Tigerclaw remarks that they weren't afraid to deliver help, and Boulder leads them to the center of camp. When Tigerclaw thinks of Russetfur, it is noted that she came from Twolegplace with Boulder. When Tigerclaw becomes leader, Boulder claims that they chose him, as they led him out of darkness after Nightstar's passing, and shown them how to be strong once more.
- He has been mistakenly called a silver tabby multiple times  and is depicted as a gray tabby in the field guides. 
- Although mentioned as a rogue, he is said to have stayed in ShadowClan during Tigerclaw's Fury.
Please do not edit this gallery
Please do not edit this gallery
- Unnamed she-cat: Status unknown
- "This is it. Now, remember what I told you. The cat we're going to meet holds command over many cats. You must treat him with respect."
- —Boulder to Tigerstar while going to meet Scourge The Darkest Hour, page 3
- "He wanted me to give up my freedom and join his Clanmates! I nearly clawed off his fur. I didn't need a leader or a Clan. But he kept talking, and some of the things he said made sense."
- —Boulder Secrets of the Clans, page 57
- Boulder: "Are you really from the forest? Yeah, you smell of trees."
- Pixie: "Get away from them, Boulder."
- Yellowfang's Secret, page 97
- "He is a true ShadowClan cat."
- —Mousewing about Boulder Yellowfang's Secret, page 228
|Boulder's Apprentice Ceremony|
References and citations
- ↑ 1.0 1.1 Revealed on Vicky's Facebook page
- ↑ 2.0 2.1 2.2 2.3 Revealed in Into the Wild, allegiances
- ↑ 3.0 3.1 Revealed in The Darkest Hour, page 3
- ↑ 4.0 4.1 4.2 4.3 Revealed in A Dangerous Path, allegiances
- ↑ 5.0 5.1 Revealed in Secrets of the Clans, page 57
- ↑ Revealed in The Darkest Hour, page 179
- ↑ Revealed in The Darkest Hour, page 210
- ↑ 8.0 8.1 Revealed in The Ultimate Guide, page 81
- ↑ 9.0 9.1 Revealed in Yellowfang's Secret, page 150
- ↑ Revealed in Dawn, allegiances
- ↑ Revealed in Tigerclaw's Fury, page 37
- ↑ Revealed in Midnight, allegiances
- ↑ Revealed in Yellowfang's Secret, page 476
- ↑ Revealed in Into the Wild, chapter 24
- ↑ 15.0 15.1 Revealed in Fire and Ice, allegiances
- ↑ Revealed in Forest of Secrets, allegiances
- ↑ Revealed in Rising Storm, allegiances
- ↑ 18.0 18.1 Revealed in Tigerclaw's Fury, allegiances
- ↑ Revealed in an unknown book
- ↑ Revealed in The Ultimate Guide