Crispin was an Aves  assigned to Flight Group 1 (a.k.a. Alpha Flight a.k.a. The Burning Skies [informal]) on the Pathfinder Ship Pegasus .

Following the destruction of Flight Group 4 (a.k.a. Delta Flight, a.k.a. The Doom Patrol) in the attack on the Charlemagne Starlock, Crispin was reaffirmed to Flight Group Four as its Flight Lieutenant had taken reassignment on another ship.

Crispin and Willard II surveyed the planet Ford-Mercury upon the return of the Fleet of Orion to the Solar System. (Book 12: Earth)