Man's Best Fiend

Man's Best Fiend is the third episode of the series Gravity Falls: Secrets Unleashed.

Main Synthosis
After Waddles runs away, and after begging for a week straight, Grunkle Stan finally agrees to get Mabel another pig, but the one she chooses raises Dipper's suspisions. But then, Dipper finds out that the pig is really a Shape-Shifter that has set his sights on Grunkle Stan. But after the Shape-Shifter escapes, Dipper must find out who he's turned into before its too late.

End Credits Cryptogram
TEBK VLR DBQ VLRO DXJB LK, VLR JFDEQ KBSBO DBQ FQ LCC, which when put through the Caesar Cipher, becomes WHEN YOU GET YOUR GAME ON, YOU MIGHT NEVER GET IT OFF.