Description:
dark horse
/ˈdärk ˈˌhôrs/
noun
1. a candidate or competitor about whom little is known but who unexpectedly wins or succeeds.
"a dark-horse candidate"
A.Z. Burton LULLABY
Steve Loiaconi PENUMBRA
Danny Menter SPUDDY
Corey Miller THE QUICK AND THE JURASSIC UNDEAD
Wayne Kyle Spitzer THE BUG AND THE EGG
Nenad Pavlovic THE TERROR AT WOODRUFF
Michael Penncavage THE WATCHMAN
James Crowell A POX ON THEM
TS S. Fulk GHOST TOUCH
Stephen Meisel