Saving the Marvel Universe is always better with friends — and Marvel Cosmic Invasion was built from the ground up for chaotic, four-player co-op mayhem. Whether you're brawling on the same couch, teaming up online, or trying to connect across platforms, this guide gives you every answer players are currently searching for.

If you're here because:
✔ your friend is on Switch and you’re on PC
✔ crossplay isn’t working
✔ you can’t join a lobby
✔ you want the best co-op team comps
✔ or you just want to jump into a mission together…

Let’s assemble your squad.

⭐ 1. Multiplayer at a Glance: What You Can Do

Marvel Cosmic Invasion is a 4-player cooperative PvE beat-’em-up — there is no PvP.

You can play in two modes:

1) Local Couch Co-op

✔ Up to 4 players
✔ Single shared screen (not split-screen)
✔ Works on PC, PS5, Xbox, Switch
✔ Great for families or parties

2) Online Multiplayer

✔ Cross-platform play between:

PC (Steam & Game Pass)
PlayStation 5
Xbox Series X|S
Nintendo Switch

✔ Invite friends directly
✔ Use Session ID / Invite Codes
✔ Matchmake with random players

Crossplay is enabled at launch, which is rare — and amazing.

⭐ 2. How to Set Up Local Co-op

This is the easiest way to play with friends.

Steps:

Connect up to 4 controllers.
From the main menu, start or continue your campaign.
At the character select screen, each player presses any button.
Choose heroes and jump into a mission.

Tip: Since the camera is shared, your team must stick together. Wandering too far causes the camera to lock.

⭐ 3. How to Start Online Multiplayer (Quick Guide)

Open the Party Up menu from the main screen.
Create an online lobby.
Choose one of the following:
- Invite Friends (same platform)
- Share Session ID (different platforms)
Friends enter the Session ID under their Party Up menu.

You’re in!

⭐ 4. Crossplay Explained

Crossplay allows PC, Switch, PlayStation, and Xbox players to play together seamlessly.

Supported Platforms:

✔ Steam (PC)
✔ Xbox Game Pass (PC)
✔ PlayStation 5
✔ Xbox Series X|S
✔ Nintendo Switch

Crossplay Requirements:

All players must run the same game version
Online memberships must be active (console only)
Internet connection must be stable

Most connection failures happen because one player didn’t update their game.

⭐ 5. How to Enable/Disable Crossplay

These toggles are commonly searched, especially by Switch and Xbox players.

PlayStation 5

Settings → Online → Crossplay → On/Off

Xbox Series X|S

Settings → General → Online Safety →
Allow “Cross-Network Multiplayer”

Nintendo Switch

Settings → Internet → Crossplay → Enable

PC (Steam / Game Pass)

Settings → Gameplay → Crossplay → On

⭐ 6. Cross-Save / Cross-Progression Status

Here’s the simple answer (and one of the most searched questions):

❌ Cross-save is NOT supported.

Your campaign progress, hero levels, and unlocks stay on your platform.

Example:
You cannot start on PlayStation → continue on Switch.

⭐ 7. Platform Requirements & Notes

You MUST have:

PS5: PlayStation Plus
Xbox: Xbox Live Gold / Game Pass Ultimate
Switch: Nintendo Switch Online
PC: No subscription needed

⭐ 8. Common Issues & Proven Fixes (Troubleshooting)

These fixes come from widespread community reports.

Issue: “Application Access Restricted” (PC Game Pass)

Fix:

When the error pops up, press the small “X” to close the popup.
Return to the title screen.
Open Party Up again.
This works 90% of the time.

Issue: “Session ID not working”

Fixes:
✔ Make sure every player updated their game
✔ The host must regenerate a new Session ID
✔ Switch players must have NSO active

Issue: “Can’t join friend on Switch”

Fixes:
✔ Enable crossplay in Switch settings
✔ Make sure NAT Type is A or B — Type D/F will fail
✔ Restart the game (Switch caching bug)

Issue: “Online multiplayer greyed out”

Fixes:
✔ Platform subscription expired
✔ NAT Type blocked
✔ Offline mode enabled in settings

Issue: “Lobby keeps disconnecting”

Fixes:
✔ Switch to wired (if possible)
✔ Put console in High Performance mode
✔ All players select the same region/server

⭐ 9. Best Team Compositions (High Synergy Builds)

These team comps are getting the most community praise.

Team Comp #1: The Balanced Avengers (Beginner-Friendly)

Captain America
Iron Man
Venom
Spider-Man

Why it works: CC + range + mobility + tankiness.

Team Comp #2: Boss Burst Squad (Speedrunners)

Wolverine
Iron Fist
Hawkeye
Black Panther

Why it works: High single-target DPS with quick cooldown cycling.

Team Comp #3: Crowd Control Chaos (Mob Farming)

She-Hulk
Storm
Ms. Marvel
Scarlet Witch

Why it works: Massive AOE chain combos melt enemy hordes.

⭐ 10. Advanced Co-op Mechanics

Master the Cosmic Swap

Use this to:
✔ extend combos
✔ interrupt boss attacks
✔ bail out downed teammates
✔ instantly reposition

Stagger Your Ultimates

Don't blow all ultimates at once.
Chain them so your team always has one ready.

Callouts = Victory

Even simple voice cues like:

“Left side elite!”
“Swapping now!”
“My ultimate is ready!”

…prevent wipes.

⭐ 11. Community Questions (Most Searched FAQs)

Can two players play on one Switch?

✔ Yes — up to 4 players locally.

Can local + online players join together?

✔ Yes, you can mix couch co-op + online friends.

Does Steam Deck support local co-op?

✔ Yes, with two controllers.

Why does crossplay lag?

Usually due to mismatched regions.
Set everyone to the same region/server.

Ultimate 2025 Guide: How to Play Marvel Cosmic Invasion With Friends (PC, Switch, PlayStation & Xbox Crossplay Explained)