(Update: Complete! Cover art by PoisonSt! It concerns only the first part, but it's awesome. This is not only a Fallout crossover!) In the aftermath of the crisis involving the universe we inhabit and Equestria, the brony that helped solve the crisis, having gained the ability of trans-universal travel at will, takes up the responsibility of picking up the missing pieces. The missing pieces are people, other humans, trapped in other universes. So the brony teams up with Twilight Sparkle, Rainbow Dash, and more throughout his adventures to bring them back home, forming the Trans-Universal Recovery Team. This romp through the multiverse brings them to a number of fictional universes, and the team must overcome various obstacles to achieve their goals.
Notes: This story is a sequel to Dropping In, and though the story is summarized in the prologue, reading that would be far better. Apart from obvious disclaimers about FiM, Pokémon is owned by Nintendo, and Fallout is owned by Zenimax Media Group.