Spike and the rest of the dragons from the Isle of Scaly are coming for the annual Maretime Bay Summer Solstice Festival, celebrated with games, picnics on the beach, and a brand new tradition… the lighting of the Dragon Torch! But, just as the dragons arrive to kick off the festival, the Mane 6 find themselves on their most… prehistoric Unity Quest yet.

A relaxing spa getaway evolves into a prehistoric panic when Scooby-Doo, the gang and the Mane 6 uncover the horrible Phantosaur, an ancient legend that comes to life to protect hidden treasures buried in secret desert caves. 

But this scare-a-saurus doesn't stand a chance with Shaggy around, after he finds his inner hero with the help of some new-age hypnosis. Like, in fact, it makes him more brave and less hungry!

Together, with the help of a brand-new friend-- a dragon queen who has lost everything to poachers-- the ponies and their Mystery Inc friends gather a whole batch of colorful suspects, including a free-wheeling motorcycle gang, greedy corporate investors and overzealous scientists, revealing that there's more pieces to this mystery than slices in a pizza! Settle into your mud bath and let the Mystery Inc. gang and the Mane 6 unearth a ton of fun for the whole family!

(S3E10 of G5 Adventures)