Here's an old, pretty decent fanfiction with far too many pop-culture references.

INTRODUCTION

When the Dark Forest won, many cats fled in terror from the clans. Tigerstar took over, merging the clans into one and dividing the clan into four camps- Dark Camp, Skull Camp, Shadow Camp, and Phantom Camp. Each camp was to be led by one of Tigerstar's supporters, and cats would be able to rise through the camps by completing a simple yet hard trial. But Tigerstar had an issue- most of his supporters were dead. So he forced StarClan to revive the cats by taking the lives of innocents.

So with his new, ruthless leaders, Tigerstar had complete and total power. He held Firestar and those who were most supportive to him captive, being tortured daily. Little did Tigerstar know, for there was a rebellion who had their hearts set on defeating him...

PROLOGUE

"You think you're so good, Firestar," a voice hissed. Two cats stood with their shoulder blades rising as they got ready to pounce, "But you and I are just the same. Two souls fighting for freedom."

"You've tortured me for long enough. Now let my cats go," growled Firestar. His bright orange fur seemed to glow, but the brown tom kept it to himself. Firestar relies on pity, he reminded himself, and you rely on strength. Remember what Thistleclaw told you.

The brown tom lept at Firestar, and Firestar was thrown against a tree trunk. Firestar gazed up at the brown tom.

"Tigerstar you disgust me," Firestar hissed under his breath.

"Oh, so you've discussed me," purred Tigerstar in amusement, "seems like that would've happened by now."

"Launch at him. Don't show those cats your weak!" Thistleclaw roared at Tigerpaw. Tigerpaw stood back, shocked and afraid.

"Really?" he mumbled.

"You are weaker than I-" Thistleclaw said, but Tigerpaw forced himself to run at the black kittypet. He was two times the size of the kitten, who didn't stand a chance.

Tigerstar blinked into reality. His hackles were raised, and he spat, "Don't you dare beat me to the end, I want to see your face as you see yourself dying." Firestar gazed at the tom, a frown engraved into his face. Tigerstar threw his claws into the tom's stomach, shreding at the flesh. He repeatedly slashed it, and Firestar looked into the scarlet pool of his blood, and his face fell.

"You won…"

"Ha, ha ha! I killed Firestar!"