This story is a sequel to G5 Adventures in Hocus Pocus

Opaline's power has risen to its highest height, and while our pony heroes are arranging a feast for their friends and loved ones for Harvest and Hugs Day, the Unity Crystals send them on one more quest in order to defeat her in the most unlikely place possible... the Himalayas.

Unfortunately, they have to do part of this separated.

Misty and Sunny get separated from their friends and join Shaggy and Scooby-Doo on on their way to join Fred, Daphne, Velma and the rest of their pony pals in Paris when they're waylaid by an ambitious hunter out to snare the abominable snowman. Figuring Shaggy and Scooby, as charter members of Mystery, Inc., can find their way to a monster, the hunter pursues the legendary Yeti from one angle while a research scientist and his assistant try to get to the creature from another.

Terribly inscrutable about the snowman is the High Lama of Shangri-La, who has his own reasons for keeping a sacred shrine to the Yeti.

When the gang and the Mane 6 are finally reunited, they can't seem to shake the beast as it spreads its icy terror, causing them to hightail it through ancient monasteries, underground caverns and outrace an avalanche to crack the mystery behind the chilling creature and defeat Opaline before both of them put our heroes on ice and in the flames... forever!

(G5 Adventures season 1 finale)