There were around TWENTY (20) mainline titles in the Call of Duty series, not counting expansions, mobile versions, or remastered editions.
There are currently SIX (6) Call of Duty Black Ops Story games in the main series:
The Black Ops story is set in the Cold War and beyond, and spans multiple games.
Immerse in WWII's pivotal theaters as Black Ops' debut, embodying soldiers across nations. Multiplayer, tanks, Zombies – a historic, thrilling Call of Duty chapter.
Call of Duty: Black Ops weaves espionage as Alex Mason pursues Soviet spy Perseus, unveiling Menendez family's pivotal legacy.
Uncover Cold War secrets as CIA's Adler with Mason and Woods. Battle Soviet threat in heart-pounding, nostalgic action. Epic prequel intensity!
Black Ops II leaps into a future battle as Mason and Woods' sons confront a sinister US government threat. Reznov's enigmatic return adds suspense.
Call of Duty: Black Ops 4 thrusts players into gripping 2043 battles with fresh characters and intense multiplayer, including innovative battle royale action.
Step into 2065's high-tech warfare. Customize your cyber-enhanced soldier for intense battles in Call of Duty: Black Ops III.