A rogue, Thunder was first introduced in Secrets of the Clans as the first leader of ThunderClan, which was named after him. When the Clans were formed, he was the best hunter in the forest. Legend says he was the one who "put in the more compassionate parts of the warrior code." He was an orange tom with white paws. However, he is only mentioned in the main storyline in Long Shadows in the prologue, where he and the other "founding leaders" (River, Shadow and Wind) are questioning Midnight, a badger who told Sol information about the Clans. It was revealed in a recent Erin Hunter chat, that Shadow, Wind, River, and Thunder did not take "star" after their names because that part of their traditions had not been established yet.