When Storm leaves ClearSky because of his horrid ways, she retires to a monster's den. She stays there until there is a horrible accident there where she doesn't make it, and none of her three kits make it, except for one, saved by GrayWing. From there on, he names him Thunder and is raised on the moorland. But, suddenly, there is a forest fire which puts GrayWing's brother and his clan in danger. So the moorland cats try to help, although it's Thunder who acted the most impressive, which ClearSky notices. He then says to join his clan, which Thunder agrees to. But after a few days, Thunder realizes the cruelty beneath ClearSky and leaves along with a cat name Frost, who was going to be kicked out of the clan by ClearSky for being injured. So the two leave the forest, in hopes of fitting in with the moorland cats.

After Storm died in the shed Thunder was born, Gray Wing raised him. But then a forest fire tears through the forest where Clear Sky and his cats live.They are helped by a rogue named River Ripple, and they save Tall Shadow and Moon Shadow from a ring of fire. Clear Sky is impressed by Thunder, and invites him to join his "clan". Thunder lives there for a few days, but leaves with another cat named Frost. Frost was thrown out because he had a deep cut on his paw, and Thunder leaves because he is fed up with Clear Sky not helping old or sick cats.

P.S. Thunder will be the first leader of ThunderClan, Thunderstar!!!!!!!!!

uhhhhhhhhhhhhhhhhhhhhhhhhhhh...................................... so Jagged Peak got buried alive but Wind and Gorse saved him. Gray Wing became leader but had breathing problem because of the fire so Wind took over as leader. Thunder joined Clear Sky's clan but hated it. At the end, Thunder and another cat left the clan. The other cat was threw out because of an infected paw. Thunder got fustated and went with him. so ya. ;3