History
Prize Comics

The first Black Owl was Doug Danville millionaire playboy, who first appears as K the Unknown in Prize Comics #1, and then as The Black Owl in Prize Comics #2. Later in Prize Comics #34, Doug passes the mantle to Walt Walters when he enlisted to fight in the second World War. Walt was the single father of the twin boys Rick and Dick Walters, who had been fighting crime for a couple of years under the names “Yank” and “Doodle”. As the new Black Owl, the boys functioning as his sidekicks. BOTH Black Owls have since fallen into public domain.
Dynamite Entertainment
Project Superpowers: Chapter Two

The Walt Walters Black Owl would get a new lease on life in the pages of Project Superpowers: Chapter Two and spin-off books The Death-Defying ‘Devil and Black Terror.
Power Comics
The Masters
The Doug Danville Black Owl is set to appear alongside with Air-Man, Arrow, Fly-Man, Plymo the Rubber Man and Twister as the leader of The Power Corps.