Lyra: *Very happy* So many humans. Which one do I like the most?

It was then, Rarity, and Fluttershy arrived with Captain America, Iron Man, and Bruce Banner

Rarity: *Sees Lyra* Oh dear.

Iron Man: So...we were brought here to fight Thanos?
She Hulk: *Appears* I'm here. There will also be a few others.
(May I use more than one post to bring in new characters?)

Certainly.

Captain America: Where is he anyway?

Nick Fury: Right here.
Big Hero 6: *Enters from a portal*

Namor the Submariner: *Enters from a portal*

Wolverine: *Enters from a portal*

Scarlet Witch and Quicksilver: *Enter from a portal*

Iron Man: This should be it...
Loki: *Enters from a portal* That's not quite true...
Thor: LOKI! What are you doing here?!

Rarity: I'm guessing he's a bad guy.

Iron Man: He's one of the worst...
Eternity: *Appears from nowhere* SILENCE!

Rarity: And who is he?

Eternity: I am Eternity. I am the universe. Thanos is threatening all worlds.
Princess Celestia and Doctor Strange: *Walk up to Eternity*
Eternity: I have been waiting for you two.

Rainbow Dash & Pinkie Pie: *Arrive*
Rainbow Dash: Where is that Silver Surfer? He was with us a minute ago.

Silver Surfer: *Arrives*

Pinkie Pie: Welcome back Silver Surfer, we missed you.
Lyra: *Her eyes get wide open* So shiny.

Doctor Strange: Princess Celestia and I will open the portal to the lair of Thanos. Captain America, Iron Man, The Hulk, Thor, Silver Surfer, Captain Marvel, Adam Warlock, Quasar, Spider Man, She Hulk, Wolverine, Namor, GoGo Tamgo, Fredzilla, Wasabi No Ginger, Quicksilver, and Scarlet Witch will go to fight Thanos.

Princes Celestia: And Doctor Strange, Hiro Hamada, Baymax, Rocket Raccoon, Groot, Star Lord, Drax the Destroyer, Moon Knight, Hawkeye, Black Widow, Nick Fury, and Loki will stay here to guard Equestria.

Rainbow Dash: What do you want Twilight, and us to do?

Princess Celestia: I need you all to stay here.
Groot: I am Groot.
Hiro Hamada: Celestia, you need to stay here!
Princess Celestia: I'm sorry. If I die, Twilight Sparkle, I need you to take care of everyone.
Twilight Sparkle: Okay.

Captain America: Alright, let's get going.

Doctor Strange: *Opens a portal to the lair of Thanos* Since his lair is in space, I cast a spell for you to be able to breathe for one hour.
Iron Man: Got it.
(I kind want two things to go on, one where the heroes fight Thanos, and the other will be...things happening in Equestria)

Good idea

Hawkeye: *Goes through the portal*
Captain America and Black Widow: *Follows Hawkeye*

The Rest: *Goes through the portal*
Loki: *Closes the portal*

Rainbow Dash: What do we do now Twilight?

Twilight Sparkle: I don't know.
Loki: *Teleports away*
Baymax: Where did he go?!

Pinkie Pie: He just disappeared.

*The Lair of Thanos*
Thanos: *Spots all of the heroes and stops time*

What happens when he stops time?

Nothing else except him and whoever he chooses can't move
Thanos: *Stores up energy in the Power Gem* I'm ready...*Snaps fingers, and starts time again*

Hawkeye: *Shoots explosive arrow at Thanos*

Thanos: *Uses the Gravity Gem and sends the explosive arrows away*
Iron Man: *Fires laser rays*
Thanos: *Uses the Reality Gem and changes the laser rays into water*

Captain America: We need to get those gems away from him.
Black Widow: But how?

Wolverine: *Charges at Thanos*
Thanos: *Blasts Wolverine, and makes his Adamentium bones into rubber*
Wovlerine: *Falls* I...can't...move...

Captain America: *To Black Widow* Don't do what Wolverine did.
Hawkeye: Let's try to distract him while someone else gets the gems.

Thanos: *Blasts a dissolving ray at Hawkeye and She Hulk*
She Hulk: *Dodges*

Hawkeye: *Avoids the dissolving ray, and shoots another arrow at Thanos*

Thanos: *Sends the arrow back to Hawkeye and changes it into a giant rock*

Hawkeye: Whoa! *Moves right*
Black Widow: *Shoots one of the gems*

Thanos: *Lets it hit, and the bullets bounce off the Infinity Gems* You cannot injure a god! *Causes an earthquake*
Namor and She Hulk: *Charge at Thanos*
Thanos: *Blasts them with the Time Gem, causing them to accelerate their evolution, leaving them as dirt*

Captain America: Thor, try using your hammer.

Thor: *Jumps at Thanos with Mjlonir*
Thanos: *Opens a portal to the ends of the Universe and sends Thor to the very tip, and then closes the portal*
Hulk: *Roars and charges at Thanos*
Thanos: *Changes to massive size, steps on Hulk, killing him*
*Meanwhile on Equestria*

Moon Knight: *Looking around* Something's wrong...
Daredevil: Where did Loki go?

Rarity: I thought he went into the portal with the others.

Nick Fury: No. Eternity left us here.
Twilight Sparkle: *Gets a splinting headache*
Star Lord: *Looks at Twilight Sparkle* What's wrong?
Groot: I am Groot.

Rainbow Dash: Where did you come from?

Rocket Raccon: Groot's been here for a while.
Groot: I am Groot.
*Princess Celestia's castle*
Loki: *Pockets the Elements of Harmony*

Canterlot Guards: *Arrive with assault rifles* Hey, what are you doing with those?!

Loki: *Summons a Destroyer*
Destroyer: *Fires powerful energy beams at the Canterlot Guards*

Half of the guards get killed.

Canterlot Soldier: Open fire. *Shoots Destroyer 15 times*
Canterlot Soldier 64: *Shoots at Loki*

Destroyer: *Unaffected*
Loki: *Reflects the bullet back at the Canterlot Solider*

Canterlot Soldier: Ah *Gets shot*
Canterlot Soldier 55: We need backup. Get Twilight, and her friends over here now!