system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] Are the Tesseract and the Cosmic Cube from the comics the same item?

I have seen a few images from the comics that talk about the Cosmic Cube, and even where they comically drop it on a few occasions. Thanos seems to go after it on several occasions, and in the latest run Red Skull used it to alter Cap's timeline. 

In the MCU, the blue cube thing is the Tesseract and houses the Space Stone. But is the comic's Cosmic Cube the same thing, or is it separate from the Infinity Gems?
gpt
No, in mainstream Marvel Cosmic Cubes are different things. It's basically a specific structure (not necessarily a cube), infused with a whole lot of extradimensional energies, which responds to the will of a mortal mind. 

In essence, these Cosmic Cubes can grant wishes, and if you gather  up enough of them, they potentially can rival an Infinity Gauntlet. In general these things can allow you to rearrange matter, time-travel to retcon shit, bring back the dead and other shenanigans. 

Last one for example, made Captain America a HYDRA agent. 

Basically, Cosmic Cubes are shit not to be fucked with. There are also some caveats to them. Some Cosmic Cubes have finite amount of power, and can run out. Others actually develop their own minds, and evolve into living beings, like Kobic, or that Skrull one that became known as Shaper of Worlds.