First Appearance: Giant-Size Man-Thing #5
Sometime in the 1670's the
vampire Dracula, who was starving for blood, fed
on Bessie the cow. Bessie died but several
nights later rose as a vampire cow.
Many years later Bessie,
presumed dead following an encounter with Howard
the Duck, is resurrected by Dr. Kilgore.
Hellcow teams up with Deadpool to defeat the mad
Deadpool Team-Up #885
Marvel Wiki - Hellcow