Call of Duty Campaigns Explained: Sub-Series, Settings and Story Arcs

Call of Duty releases a new game almost every year, and with more than twenty main entries it is easy to lose track of how the single-player campaigns relate to one another. The good news is that the series is not one continuous story. It is a collection of sub-series, each with its own setting, characters and continuity. Once you know which family a game belongs to, the whole series becomes much easier to navigate.

This guide covers the campaigns only: no multiplayer, Zombies or Warzone. It groups the main games by sub-series, lists their settings and recurring characters, and offers suggestions for where to start.

How the series is organized

Call of Duty is published by Activision and developed by a rotating group of studios, mainly Infinity Ward, Treyarch and Sledgehammer Games, with Raven Software increasingly involved in campaign work. Broadly speaking:

• Infinity Ward created the series and the Modern Warfare games.
• Treyarch is responsible for Black Ops and World at War.
• Sledgehammer Games made Advanced Warfare, WWII, Vanguard and Modern Warfare III (2023), and co-developed the original Modern Warfare 3.

Each studio tends to stick to its own story universe, which is why the sub-series feel distinct.

What a Call of Duty campaign feels like

Whatever the setting, most Call of Duty campaigns share a recognizable style. Missions are largely linear and tightly scripted, moving the player through a sequence of firefights, set pieces and quieter moments such as stealth or sniper sections. AI squadmates fight alongside you and drive the action forward, and the camera rarely leaves the first-person view, even during dramatic scripted events. Health regenerates when you take cover, a design that console shooters such as Halo helped popularize with recharging shields.

Later entries experimented with this formula. Some added hub areas between missions, optional objectives, gadgets or wider levels that can be approached in different ways, and a few introduced story choices. Even so, the core identity remains a fast, cinematic and relatively short campaign.

World War II games

The series began in World War II, and several entries have returned to the era.

The early games used a structure of multiple national campaigns, with the player switching between soldiers of different armies. They emphasized squad-based combat, with AI allies fighting alongside you, which felt fresh at the time.

World at War is especially important because it introduced Viktor Reznov, a Soviet sergeant who later became a key figure in Black Ops. A version of Captain Price also appears as a British officer in the first two games, a precursor to the Captain Price of Modern Warfare.

These games are largely standalone. You can play any of them without knowing the others.

Modern Warfare: the original trilogy

Call of Duty 4: Modern Warfare (2007) moved the series into a contemporary setting and became one of the most influential campaign shooters of its generation.

• Call of Duty 4: Modern Warfare (2007) – The player alternates between Sergeant “Soap” MacTavish of the British SAS, serving under Captain John Price, and a US Marine. The story deals with an ultranationalist uprising in Russia and a coup in the Middle East. It is remembered for levels such as “All Ghillied Up,” a sniper mission in Pripyat.
• Call of Duty: Modern Warfare 2 (2009) – Task Force 141, including Price, Soap and Simon “Ghost” Riley, hunts the Russian terrorist Vladimir Makarov.
• Call of Duty: Modern Warfare 3 (2011) – The conclusion of the arc, as the war spreads across Europe and Price pursues Makarov.

The original trilogy forms one continuous story and should be played in order. Call of Duty 4 was remastered as Modern Warfare Remastered in 2016, and the Modern Warfare 2 campaign was remastered in 2020.

Modern Warfare: the reboot trilogy

In 2019 Infinity Ward restarted the Modern Warfare series with a new continuity. The names are familiar, but these characters are reimagined versions rather than the same people.

• Call of Duty: Modern Warfare (2019) – A grittier story following Captain Price, Sergeant Kyle Garrick and Farah Karim, the leader of a rebel force in a fictional country.
• Call of Duty: Modern Warfare II (2022) – Task Force 141 returns, with Price, Soap, Ghost and Gaz pursuing threats across the Middle East and Mexico.
• Call of Duty: Modern Warfare III (2023) – Developed by Sledgehammer Games, it brings back a reimagined Makarov.

The reboot trilogy is a separate continuity, so you do not need to play the original Modern Warfare games first, although many reboot scenes reference the originals.

Activision has announced Call of Duty: Modern Warfare 4, developed by Infinity Ward, for October 23, 2026 on PlayStation 5, Xbox Series X|S, PC and Nintendo Switch 2. According to Activision’s announcement, its campaign centers on a North Korean invasion of South Korea and features Captain Price. Details may change after launch, so check official sources.

Black Ops

Treyarch’s Black Ops series focuses on covert operations, conspiracies and Cold War paranoia. It contains some of the series’ most story-driven campaigns.

Black Ops is known for unreliable narrators, interrogation framing and twists. Black Ops II added branching story choices that affect its ending. Black Ops Cold War offers dialogue decisions and multiple endings. Black Ops 7 continues David Mason’s story ten years after Black Ops II and was designed with a campaign playable solo or in co-op with up to four players.

The recurring character to know is Frank Woods, who appears in many entries across different decades. Alex Mason and his son David anchor the main family storyline.

Recommended order: Black Ops, Black Ops II, then Cold War and Black Ops 6, which fill in the gaps between the 1960s and the 2020s, and finally Black Ops 7. Black Ops III is largely a self-contained story and can be played whenever you like.

Futuristic entries

For a period in the 2010s, the series experimented with near-future and science-fiction settings outside the main sub-series.

• Call of Duty: Ghosts (2013) – Infinity Ward. After a catastrophic attack on the United States, brothers Logan and Hesh Walker join an elite unit called the Ghosts. A military dog named Riley accompanies the squad.
• Call of Duty: Advanced Warfare (2014) – Sledgehammer Games. A soldier, Jack Mitchell, joins a powerful private military company in the 2050s. Exoskeletons enable boost jumps and dashes.
• Call of Duty: Infinite Warfare (2016) – Infinity Ward. A space-set conflict in which Commander Nick Reyes leads a warship against a militant faction based on Mars.

These are standalone stories with no direct sequels. Infinite Warfare’s campaign, with its spaceship hub and optional side missions, is often recommended by players who enjoy the series’ single-player side.

Recurring characters at a glance

• Captain John Price – The series’ most enduring character, appearing in the original Modern Warfare trilogy, the reboot trilogy and, in a WWII-era version, the first two games.
• John “Soap” MacTavish – Price’s protégé in both Modern Warfare continuities.
• Simon “Ghost” Riley – The masked Task Force 141 operator, a fan favorite.
• Alex Mason – The protagonist of the original Black Ops, haunted by conditioning and numbers.
• Frank Woods – Mason’s friend and the most recurring Black Ops character.
• Viktor Reznov – A Soviet soldier from World at War who plays a pivotal role in Black Ops.

Where should you start?

• For the classic experience: Call of Duty 4: Modern Warfare or its 2016 remaster, followed by Modern Warfare 2 and 3.
• For a story-heavy, twist-filled campaign: The original Black Ops, followed by Black Ops II.
• For modern visuals and gameplay: The 2019 Modern Warfare reboot or Black Ops 6.
• For World War II: World at War, which also sets up Reznov for Black Ops.

Call of Duty campaigns are typically short compared with many single-player games, often designed to be completed in a few evenings. That makes them easy to sample. If one sub-series does not appeal, another might feel completely different.

Campaign tips

• Try Veteran only after a first run. The hardest difficulty is notoriously punishing in some entries.
• Watch for intel collectibles. Several games hide intel items that add backstory.
• Do not skip the briefings. Black Ops in particular relies on them to frame its unreliable storytelling.

Sources

• Call of Duty – Wikipedia
• Call of Duty: Black Ops 7 – Wikipedia
• Call of Duty: Black Ops 6 – Wikipedia
• Call of Duty: Modern Warfare 4 announcement – Activision