The Main Six have just defeated The Storm King, thus saving Equestria. They then celebrate their latest achievement with their friends and loved ones. However, during said celebrations, an eldritch horror of unknown origins rips a hole into the very fabric of reality; using the moon as a doorway to another world.

[Story continues in Terraria: Hardmode.]

Warning: Comment section may contain spoilers.

Foreknowledge of "Terraria", isn't entirely necessary, but it does help nonetheless.

Avengers: Age of Ultron crossover.

Ultron’s plan had come to perfect fruition. There would be no more war, no more chaos, because the ones who caused it all would be gone. In just a short moment, the world would be saved from its true demon. Humans.

It would have all been so much simpler…if it wasn’t for them.

The Avengers.

As it is said, as it always will be, true peace can only be granted through countless innocent lives. In hindsight, the ponies were never that different from humans. Ultron’s plan is not yet over, and soon his strings will be severed…for the last time.

Big shoutout to Shrekzilla for his amazing job on the artwork!
Sequel: This War of Ours

When strange ponies from another world suddenly pony-nap all her friends, Pinkie Pie must find a way to defeat their master all on her own. Blamed for the crime herself, she has no help from Celestia and just about every pony in Ponyville is convinced that she's finally cracked. Who can she possibly find to fill in for the other Elements of Harmony, and help her defeat the ancient evil behind it all?

This story occurs after Discord is defeated but prior to the rest of season 2. Story is featured on Equestria Daily and is now officially a 'six star' rated story! Full size image can also be found there.

Special thanks to my editor Florentine

TV Tropes entry is here.

Other images:
reference of what Blinkie and Inkie's cutie marks look like
The G1 team

This story was written for National Pony Writing Month 2011. I completed the required amount for PonyWriMo on 20th of September.

Also features: Inkie Pie, Blinkie Pie, Twilight (G1), Applejack (G1), Sparkler, Posey, Surprise, Firefly