"Adapted from the ... Disney XD animated series and featuring over a thousand TV stills."--Back cover.
"Dipper and Mabel's summer vacation in Gravity Falls just keeps getting weirder. Besides working in their Grunkle Stan's 'Mystery Shack' with Soos and Wendy, the twins are off making new friends-- including a pig named Waddles and a resurrected historical figure-- and experimenting with everything from cloning to time travel"--Page 4 of cover.
Double Dipper, episode 7 -- Irrational treasure, episode 8 -- The time traveler's pig, episode 9.