Principal photography on The Avengers is just over a week away from completion and since production has moved to the very public streets of Cleveland, we’ve all been treated to a series of revealing set photos and videos. First we saw Chris Evans in his modern Captain America costume along with some mysterious villains and technology then we saw him get knocked out of a building onto a car, where he then teamed up with Thor for some more fisticuffs.

Not unlike the recent series of set photos for The Dark Knight Rises, this unofficial publicity for Marvel Studios is helping fans of the comics piece together plot elements for The Avengers, and now we can add another piece to that puzzle with new set photos which reveal an alien vehicle that has crash landed in the city.

The latest set photos depict what we safely assume is an alien space vehicle of some sort. After seeing the recent Avengers set videos and photos of Thor and Captain America fighting a group of stuntmen in motion-capture suits – who we assume are alien invaders – them having vehicles is only logical.

However, the design of this vehicle looks very to similar to that of the architecture, weapons and attire from Asgard we saw throughout Thor so at first glance, we thought it could be the vehicle that helps Chris Hemsworth’s character return to earth.

Take a look at the vehicle itself and tell us what you think it is:

But, there are more photos of a similar vehicle that crashed, with one sporting an injured motion-capture actor beside it. By alien invaders, we are of course referring to the Skrulls who have long been rumored – and now seemingly confirmed – to be the villainous “army” that Loki (Tom Hiddleston) brings to earth, spreading their conflict with another aliens species, the Kree, to our home where Cap, Thor, Iron Man, Hulk and the S.H.I.E.L.D. organizing must protect us.

These next two images, show another vehicle of the same design, with what we believe to be a Skrull beside it. Is this confirmation of alien attack vehicles being used against The Avengers on earth and was it Iron Man, Thor, SHIELD’s helicarrier and quinjets, or a combination of them all that shot them down?

I guess it’s not Thor’s ride.

Either way, The Avengers are without a doubt battling alien characters, and just a few weeks ago director Joss Whedon and co. shot scenes at NASA’s Plum Brook Station’s Space Power Facility which included Samuel L. Jackson’s Nick Fury and Jeremy Renner’s Hawkeye characters. This may mean that SHIELD also has some space tech, along with their quinjets.

For the latest on The Avengers, be sure to read our recap of the new footage shown at Disney’s D23 event last weekend. Avengers Assemble? No. Aliens Invade!

The Avengers stars Robert Downey Jr., Chris Evans, Chris Hemsworth, Mark Ruffalo, Scarlett Johansson, Jeremy Renner, Samuel L. Jackson, Cobie Smulders, Clark Gregg, Tom Hiddleston and Stellan Skarsgard. It is of course written and directed by Joss Whedon, opening in theaters on May 4, 2012.

Follow me on Twitter @rob_keyes.

Sources: Cleveland Live, Daily Blam, SHH