- Serious Sam The Third Encounter plot directly continues the story of The Second Encounter.
- Sam Stone keeps fighting Mental's alien forces across new alien worlds.
- Confirmed facts are limited: the game is in early development with a TBA release date.
- No official trailer for this entry exists yet, so treat detailed plot leaks as unverified.
- Core identity: classic run-and-gun combat, huge enemy hordes, and arena battles.
What We Know About the Plot So Far
The Serious Sam The Third Encounter plot is still largely under wraps, and that is the most important fact any fan should understand before reading speculation online. The official Steam listing confirms only a handful of story details: the game is developed by Croteam, published by Devolver Digital, and directly continues the adventure established in The Second Encounter. It is not a prequel, not a spin-off, and not a reboot.
The confirmed story pillars are summarized below:
| Story Element | Confirmed Status | Details |
|---|---|---|
| Sam Stone as protagonist | Confirmed | Sam continues his one-man war |
| Mental as the antagonist | Confirmed | His alien forces return as the enemy |
| Direct sequel to The Second Encounter | Confirmed | Steam description links the two adventures |
| New alien worlds | Confirmed | Steam listing mentions exploration of new worlds |
| Specific level names | Not announced | To be confirmed |
| New characters or allies | Not announced | To be confirmed |
Because the game is unreleased, many websites recycle plot summaries from Serious Sam 3: BFE or older entries and label them as The Third Encounter story details. Always cross-check claims against the official Steam page or Croteam's channels before treating them as canon.
Series Timeline: Where The Third Encounter Fits
To understand where this game sits, you need the bigger picture of the series' chronology. The Serious Sam saga follows Sam "Serious" Stone, humanity's last hope against the alien overlord Mental, blending time travel to ancient Egypt and beyond with relentless first-person action.
| Release | Role in Timeline | Key Events |
|---|---|---|
| The First Encounter | Series start | Sam travels to ancient Egypt, hunts Sirian tech |
| The Second Encounter | Immediate continuation | Sam's journey continues toward Mental's forces |
| Serious Sam 3: BFE | Prequel-era setting | Earth's final stand before the First Encounter |
| The Third Encounter | Upcoming sequel | Continues directly after The Second Encounter |
The Sirian civilization plays a recurring role in this lore. Ancient Sirian technology, artifacts, and ruins drive much of Sam's exploration, and the official positioning of The Third Encounter around "new alien worlds" suggests the Sirian legacy will remain central to the story.
If you want to prepare for The Third Encounter's story, replaying the final chapters of The Second Encounter is the best primer, since the new game picks up that adventure rather than starting fresh.
Sam vs. Mental: The Core Conflict
The heart of every Serious Sam plot is simple and effective: Sam Stone against overwhelming odds. Mental's armies, including Kleer Skeletons, Gnaars, Werebulls, Biomechanoids, and boss-scale threats like Ugh-Zan, exist to flood the battlefield while Sam fights through them toward the source of the invasion.
Sam Stone
- One-man army with heavy weaponry
- Signature humor and bravado
- Tasked with stopping Mental
Mental
- Alien overlord and final antagonist
- Commands endless hordes
- Rarely appears directly in person
Sirian Legacy
- Ancient advanced civilization
- Technology scattered across worlds
- Drives exploration and level design
Expect the plot to be delivered the classic way: through environmental storytelling, brief mission briefings, comedic one-liners from Sam, and escalating set-piece battles rather than long cinematic cutscenes. That pacing matches how Croteam has framed the series' storytelling since the beginning.
Serious Sam games tell story through action. Do not expect lengthy dialogue sequences; the plot moves forward through mission objectives, arena encounters, and Sam's commentary mid-battle.
How to Follow the Plot: Newcomer Reading Order
If you are new to the series and want the story context for The Third Encounter before launch, follow this sequence:
Start with The First Encounter
Play through Sam's arrival in ancient Egypt and learn the Sirian backstory that underpins the whole series.
Play The Second Encounter
This is the direct predecessor. Its ending is the launching point for The Third Encounter's story, so pay close attention to the final missions.
Optionally Add Serious Sam 3: BFE
BFE adds background on Earth's fall and Sam's earlier career, enriching the timeline without being required reading.
Track Official Announcements
Follow the Steam page and Croteam's channels for the first real story trailer and confirmed plot details as development progresses.
Bookmark the official Steam listing and Croteam's website. When the story trailer finally drops, those sources will publish the first verified plot details anywhere.
Co-op and How It Shapes the Story Experience
The Steam listing confirms single-player, online co-op, and shared/split-screen co-op modes. While co-op does not change the plot itself, it changes how you experience it: fighting through the campaign with friends turns story missions into chaotic shared battles, which has always been a signature of the franchise.
| Mode | Confirmed | Story Impact |
|---|---|---|
| Single-player | Yes | Standard plot progression |
| Online Co-op | Yes | Same campaign, team-based battles |
| Shared/Split Screen | Yes | Local cooperative playthrough |
| PvP modes | Not confirmed | No official announcement yet |
Learn the campaign solo first to absorb mission context and enemy patterns, then replay in co-op for the full chaotic experience.
Plot Watch Checklist and FAQ
Use this checklist to stay on top of verified story news as development continues:
Verified Plot Tracking Goals:
- Confirm the official story trailer release
- Verify new alien world names after launch
- Track new or returning characters
- Document connections to The Second Encounter ending
- Record confirmed boss encounters
Q: What is the Serious Sam The Third Encounter plot about?
Based on the official Steam listing, the plot continues Sam Stone's fight against Mental's forces directly after the events of The Second Encounter, taking him to new alien worlds. Detailed story beats have not been announced yet because the game is in early development.
Q: Is The Third Encounter a prequel or reboot?
No. The official Steam description positions it as a direct continuation of The Second Encounter, not a prequel, spin-off, or reboot of the series.
Q: When does the game release?
There is no confirmed release date. The Steam page currently lists the game as To Be Announced, and development is ongoing at Croteam with Devolver Digital as publisher.
Q: Can I play the story in co-op?
Yes. The Steam listing confirms online co-op and shared/split-screen co-op alongside single-player, so the full campaign story can be experienced with friends.