Rumors have been flying around this week surrounding the forthcoming 'Call of Duty Black Ops 4' - the latest COD game that's allegedly set for a 2018 release.
Although the details are yet to be confirmed, it's likely, considering the franchise releases a new installment every year.
While you're waiting for more details to come in, check out this definitive ranking of the best games in COD history.
The experts over at GamesRadar managed to whittle it down to ten out of 20, putting them in order from the least to the best.
10. 'Call of Duty: World at War' (2008)
Players were delighted with the release of 'World at War' thanks to the series returning to its World War II roots.
This game offered an impressive amount of content including a solid single-player campaign, co-op play, a huge multiplayer suite, as well as the added Nazi Zombies.
While the zombies were supposed to be simply a fun little addition, it turned out to be one of the best modes, offering a tense, claustrophobic, and addictive play.
9. 'Call of Duty: Modern Warfare 3' (2011)
As the third and final installment in the 'Modern Warfare' saga, many claimed it to be the weakest of the three.
However, the game contains spectacular set pieces, hard-hitting action, and outrageous mass-destruction.
These stories are wrapped up with some excellent missions - the rolling sandstorm in Return To Sender a notable best - making 'Modern Warfare 3' as addictive as its predecessors.
8. 'Call of Duty 2' (2005)
While some might argue that this classic is not high up enough on the list, the only reason is because of the increased standards of the games to follow thanks to the advancement of graphics and gameplay within the franchise.
Other games aside, 'Call of Duty 2' is one of the best World War II shooters of all time, offering immense, intense, and realistic battles. An abundance of campaigns (the best being the Russian Mission) keeps the pace up, following individual soldiers opposing the German army on all fronts.
7. 'Call of Duty: WWII' (2017)
While it seemed odd for the franchise to head back to the second World War after so much had happened, COD's return was an enjoyably fast-paced take on the classic setting.
Offering a great new campaign and a creepy update on the Nazi Zombies, 'Call of Duty: WWII' really triumphed thanks to its multiplayer mode, where you die fast, regenerate fast, and kill fast.
It's a satisfyingly addictive cycle and the World War II setting is ideal for interesting the new player classes.
6. 'Call of Duty: Advanced Warfare' (2014)
If you enjoyed 'Call of Duty 2', loved 'Modern Warfare', and relished jumping from one giant action sequence to the next, then 'Advanced Warfare' was almost definitely your cup of tea.
Sledgehammer's debut campaign offered some uniquely manic set pieces that kept you rolling through levels.
Furthermore, the powerful missions opened up to give some surprising freedom (for example in the Stealth Level), meaning you can feel like a badass without needing to blow anything up.
5. 'Call of Duty: Black Ops 2' (2012)
This game is the first in the franchise that experiments with multiple endings to good effect. Carrying out Strike Force missions and specific objectives completely changes the direction of the story, adding a well-received depth to the game.
The wealth of gameplay, engaging story with the campaign, entertaining action, and excellent twists make 'Black Ops 2' an ambitious and exciting COD contribution.
4. 'Call of Duty: Infinite Warfare' (2016)
By this point, the COD series had been criticised for being predictable and sidelining its single-player modes. That's where 'Infinite Warfare' came in, rectifying these issues with a single-player campaign that moved into the future.
The multiplayer mode also added more enhanced guns and suits, with the Combat Rig System an able replacement for the Specialists of 'Black Ops 3'.
Meanwhile, the enticing storyline that launched into an interplanetary war made this a creative triumph for the franchise.
3. 'Call of Duty: Modern Warfare 2' (2009)
The second installment in the 'Modern Warfare' series had some big boots to fill, and while it didn't quite come as close, the creators gave it a bloody good go.
Spec Ops mode added a challenging two-player cooperative multiplayer experience on top of the acclaimed Death Mate mode.
One downfall includes the controversial No Russian mission, but the game brings it back with endless iconic moments, such as storming the gulag to rescue an important prisoner.