This story is a sequel to Wonderbirds: Beneath the Abyss

'Calling Equestrial Rescue, this is General Dapper of the Indoneighsian Army. We have been assisting with the evacuation of all settlements in the vicinity of Mount Kraken, a volcano that has been ejecting ash for several hours now. The cloud already covers an area hundreds of miles wide, but we expect a full-scale eruption very soon. We have had to abandon our rescue efforts due to increasing seismic activity, but there is still a small group of ponies unaccounted for. Our reports indicate they were hiking near the mountain, but we can find no sign of them. Time is short, can you help us?'

Crossover with the hit 1960's TV show Thunderbirds, which is the property of the Gerry Anderson Legacy and ITV Studios.

Wonderbirds is a series of standalone, episodic one-shots and shorts, not set in a linear narrative to each other. Though presented as a series of stories, you do not have to have read previous ones to understand the narrative in each one.