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Is there any specific reason for the name change? According to me, Cosmic Cube seems a nice and cooler name.

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At least it wasn't called 'The AllSpark'. It's not out of the realm of possibility. – Solemnity Mar 14 '13 at 5:05
I answered this question in complete detail showing why the Cosmic Cube and the Tesseract were completely two different objects. – Thaddeus Howze Nov 9 '13 at 1:14

Because they aren't specifically the same thing. While they share a similar abilities (the power to alter the environment around them, and the generation of colossal amounts of energy) the Tesseract in the Marvel Cinematic Universe is essentially a doorway through space (and possibly time), the Cosmic Cube is an object of immense power that has several vaguely defined abilities. They both can be associated with the mad Titan Thanos and the Red Skull in both universes. The fact that Marvel Studios chose not to explicitly refer to the object depicted in Thor, Captain America: The First Avenger, and Avengers as "The Cosmic Cube" allows for them to use that name to describe another cube if they chose to show A.I.M. creating one in a later movie.

In Thor: The Dark World, it's revealed that the Tesseract is in fact one of the Infinity Gems. Something they were able to do because they previously avoided calling it a Cosmic Cube.

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Are you sure about this? Read this: and this: – Dhwaneet Bhatt Mar 22 '13 at 5:02
You say the Tesseract is a doorway and Cube is "an object of immense power," but clearly the Tesseract is also an object of power. In Captain America: The First Avenger, for instance, that's precisely what we see---the Tesseract was a power source, in that case being use to power futuristic Hydra weapons. So it's a doorway AND "an object of immense power" like the Cube. – FoxMan2099 Nov 8 '13 at 21:51
@FoxMan2099 Being a doorway was it's primary function, the fact that it boasted immense power was incidental. The Cosmic Cube's main function was to reshape reality to it's masters whims. – Monty129 Nov 8 '13 at 21:56
Incidental? That's the danger that drives the plot of The First Avenger---the Red Skull can power futuristic weapons with the Tesseract/Cube. – FoxMan2099 Nov 9 '13 at 2:34
If you had a reality bending energy wouldn't that essentially be capable of creating a doorway anyway? So what's the difference between the two? Personally I think they are literally the same thing just with different names. Albeit it some minor differences as it's considered one of the infinity gems in the marvel cinematic universe. – DoctorWho22 Jun 30 '14 at 13:49

In-multiverse explanation: There are several different "universes" within the Marvel Multiverse, and each of these vary slightly. In some, the X-Men were wiped out by sentinels, etc.

The movies are clearly from a different universe than the main comic book universe. You'd expect differences like this.

The fact that this is an alternate universe is even covered by the Wikipedia article on the Chitauri:

The Chitauri are a fictional race of extraterrestrial shapeshifters that appear in publications by Marvel Comics's alternative universe, Ultimate Marvel, in the limited series The Ultimates. They were created by Mark Millar and Bryan Hitch. They were created for the Ultimate universe franchise in place of the existing Marvel Comics alien species, the Skrulls, which play a similar role in the franchise's mainstream continuity. Later, Marvel would choose to distinguish between the Skrulls and Chitauri of the Ultimate universe. The species would later be adapted to other media, notably appearing in the 2012 film The Avengers as an invasion force led by Loki.

All of that merely shows that there are several different universes in the Marvel Multiverse. In the movie, we were simply in a different reality (namely earth-199999). There's no real reason to even expect that the cube is a Cosmic Cube.

The properties are different, and even the Marvel Comics Database indicates that this is different from a Cosmic Cube from the main continuity on the Cosmic Cube page.

Marvel Cinematic Universe (Earth-199999)

Cosmic Cube (Earth-199999)

ADourAdded by ADour

The Cosmic Cube or Tesseract, as it is mostly called, of this reality is a powerful Asgardian artifact created by Odin which possesses the abilities to create infinite energy, which can be used to create wormholes to other parts of the universe and different dimensions, rather than reality manipulation. Unknowngly why, the Tesseract was hidden on Earth.

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This needs to be edited to tie it back to the posed question. – user1027 Mar 14 '13 at 14:59
@Keen - you're right, so I added supporting documentation to show that my original answer - that the name is different is because it's from an alternate reality to the main timeline - was correct, straight from a Canon source. – David Mar 31 '13 at 2:09

Because Tesseract is not a power cube but an Infinity Gem, resembling the Mind stone which is also Blue. Shown in Thor : The Dark World ending.

Marvel Cinematic Universe is different from the existing marvel-comic-verse. So Tesseract is an Infinity Gem which looks inspired from the cosmic cube. Even Thanos' end credit scene makes more sense now because his comic counterpart wants to have all six infinity gems for a big purpose.

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If, in fact, the Tesseract is the cosmic cube appearing in Marvel comics, then the Thanos character would only need to acquire this artifact from Loki and his desires would likely be fulfilled. He would not need to send the "other" to enlist Loki's aid to conquer Earth, the cube would accomplish this task quite easily. This cube, the Tesseract, is very powerful as a source of unlimited energy, but it is not useful as a complete weapon in itself.

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In the marvel movie verse many things are changed simply because they are to complicated to do in a movie, e.g. Explaining how the cube was made as well as it being to powerful an enemy for the Avengers to battle. Especially in their first team up.

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