Rat leader

The Rat Leader was an evil, manipulating rat that possessed the ability to speak in the language of cats. Despite the fact that he was weak at fighting, he was very intelligent and controlled his huge army of rats.

Attack on Sky Clan
Not long after ancient Sky Clan was forced to leave the Forest, rats attacked the recently settled Sky Clan in their new home. The rats killed many cats and Sky Clan was destroyed. The surviving cats became Kittypets, Loners or Rouges.

Years latter, Firestar and his mate, Sandstorm came on a quest to rebuild Sky Clan. The rats saw Sky Clan gradually growing again and lead by their leader, the rats attacked. The Rat Leader told the cats that they had killed them before and they would kill them again. After the battle the Rat Leader waited until a New Moon before attacking again. The Rat Leader did no fighting and gave commands from inside the protection of a mass of rats. When the Sky Clan cats began to gain the upper hand in the battle the Rat Leader ordered his rats retreat.

Sky Clan planned an attack and attacked the rat's home, an abandoned barn. The rats killed Firestar and Rainwhisker but because of his nine lives, Firestar came back to life. Unable to tell which rat was the Rat Leader, Firestar tricked the Rat Leader into talking. Now knowing which one he was. Firestar attacked the Rat Leader and killed him. Without their leader to guide them the remaining rats broke up and fled.