This story is a sequel to The Prisoner of Zebra
In volume three of the Flash Sentry Papers, the famed hero (and self-professed coward and womanizer), recounts his misadventures during the second changeling infiltration of Canterlot.
With the Princesses captured, it's up to Flash and Special Agent Golden Harvest (a.k.a. Carrot Top) to save the day ... whether Flash likes it or not.