- Real Name: Buck Sinclair
- Identity/Class: Normal human
- Occupation: Secret Service agent
- Affiliations: Member of the secret service
- Enemies: Unknown Known Relatives: None
- known Aliases: None
- known Base of Operations: Unknown
- First Appearance: The Ranger (Amalgamated Press, 1931); Boy's Friend Library #381 (reprint; 1933)
- Powers/Abilities: Skilled with weapons, especially with whips.
History: Buck Sinclair is a member of the Secret Service, codenamed the Black Whip. Armed with a whip, with which he is highly skilled, he handles dangerous missions for the British government
