Are the bad guys from the Avengers from the comics? Or are they a movie only construct? Unfortunately I can't remember their name.
Loki is, of course, from the comics. He plays the same role as he does in the films, he's Thor's trouble-making brother.
In a recent interview, the film's director, Joss Whedon, confirmed that the villains working with Loki in the film are from the comics, specifically the Ultimate imprint:
The Chitauri are the Ultimate universe's version of the Skrulls, sort of. As the Wikipedia page on the Skrulls states:
The Skrulls in the main Marvel universe have similar capabilities as the Chitauri, as they're both invading aliens with shapeshifting powers. However, the Chitauri were created in the Ultimate universe as a distinct race from the Skrulls.
This post contains spoilers.
Yes, the strange villains helping Loki are from the comics.
We already know that Loki is the big bad from the Asgardian villain team but who are the other baddies? Using the Cosmic cube first seen in Captain America, the First Avenger, Loki summons:
An invasion fleet from Marvel Earth #1610