Cosmic Cube

The Cosmic Cube is a powerful fictional artifact appearing in American comic books published by Marvel Comics. 

 Overview 
It is an ancient, immensely powerful cube capable of granting its user virtually unlimited power, including reality manipulation, energy projection, and teleportation.

 In other media 
The most famous version of the Cosmic Cube is the Tesseract, which has appeared in various Marvel storylines, movies, and media, notably in the Marvel Cinematic Universe where it plays a significant role in the Captain America and Avengers films.