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When Danny Fenton (Phantom) goes up with Sam and Tucker to a sleepy town in Oregon called Gravity Falls to visit Sam's cousin, he gets a whole lot more adventure than he expected-and wanted!

Danny meets the Pines twins, and becomes Mabel's "Crush Of The Week", but Dipper is suspicious of him. He doesn't know that Danny's a halfa, but he has suspicions, caused by a scab on Danny's arm opening and bleeding.

Then one night Sam, Tucker, Danny, Dipper, and Mabel all have nightmares concerning a certain Illuminacho. He has big plans and he needs both Danny and Dipper to do it.

Will Danny keep his secret? Or will Dipper figure it out? Will Bill take over the world? And what's so special about Dipper?