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There's trouble brewing in Bikini Bottom. Someone has stolen King Neptune's crown, and it looks like Mr. Krab, SpongeBob's boss, is the culprit. Though he's just been passed over for the promotion of his dreams, SpongeBob stands by his boss, and along with his best pal Patrick, sets out on a treacherous mission to Shell City to reclaim the crown and save Mr. Krab's life.

It's twice the underwater hilarity in a double-length feature episode with SpongeBob, Patrick and Squidward as three pioneering sea dwellers in the time before comedy (BC). "SpongeBob Goes Prehistoric" includes a double-length episode plus eight bonus episodes: SpongeBob BC, Nature Pants, Fools in April, I'm with Stupid, Patty Hype, Squid on Strike, The Great Snail Race, Plankton's Arm, and Squilliam Returns.