There was an idea
To bring together
A group of remarkable friends.
So when we needed them,
They could fight the battles
That we never could.
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Friendship is Magic (c) Hasbro | The Hub | Studio B
Avengers (c) Marvel
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>inb4 x should be y in comments section.
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EDIT2: Avengers was an awesome movie and should feel awesome.
EDIT3 (SPOILERS FOR THOSE WHO HAVENT WATCHED THE AVENGERS): Guysguysguysguysguys. Pinkie!Hawkeye now makes sense. OKIE DOKIE LOKI -> Mindcontrolled Hawkeye.

Also here's a little workflow-buildup pic:
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-Rary Stark as Iron Mare
-AJ Rogers as Captain Equestria
-Rainthor Dash
-Pink Barton as Hawkpie
-Natasha Flutternov as Shy Widow
-The Spike
Ok, I'll kick myself now
it'd be Rainbow Rogers and Applethor.
I mean, Rainbow Dash flies AND can "kinda" contrrol the weather 8specifically movign clouds and causing thunder (as in Luna Eclipsed)...and yet Applejack gets to be Thor instead of her?
Some people like to put Fluttershy as Hulk because of her Flutterage persona, but its really not as fitting as Spike at all, and they do so mostly out of her popularity (well, she's that great).
Normally, Spike's the weakest and most helpless of the group.
So much, that he can't even go on their most dangerous missions (which Fluttershy can do because despite her shyness, her bigger size, her wings, and her ability to tame almost any beast, makes her less than helpess). But as soon as he lets a negative emotion take control of him (in his case, greed) he turns into a large, unstoppable and -mostly- mindless beast.
Hulk Smash!/Spike Want!
C'mon, he even got the Hulk's main colors (purple/green) even through they're reversed.
"You wanted to know my secret, Twi? Im always greedy".
Oh COME ON people. I live Fluttershy as much as everypony else, but you can't deny Spike is the best Hulk.