'Calling Equestrial Rescue, we need your help. My name is Bright Star, I'm the acting director of STEED. We have a number of ongoing missions, our most recent being the establishment of a mobile research lab on the planet Marecury. For the last two months the crew have been in constant communication with our main hub back here in Equestria, but about three hours ago we lost contact. The lab is a mobile platform in constant motion to stay out of sunlight, as the heat of daylight on Marecury would destroy it in minutes. Our satellites show it has stopped moving. Only you can get there before the next sunrise.'

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.