Shrek is an ogre and the main character of the "Shrek" franchise.

"Guardians of the Galaxy" is a 2014 American superhero film based on the Marvel Comics superhero team of the same name. Produced by Marvel Studios and distributed by Walt Disney Studios Motion Pictures, it is the 10th film in the Marvel Cinematic Universe (MCU).

In the film, after stealing a mysterious orb in the far reaches of outer space, Peter Quill from Earth is now the main target of a manhunt led by the villain known as Ronan the Accuser. To help fight Ronan and his team and save the galaxy from his power, Quill creates a team of space heroes known as the "Guardians of the Galaxy" to save the galaxy.

The main members of the "Guardians of the Galaxy" team:

Gamora - an orphan from an alien world who seeks redemption for her past crimes.

Groot - a tree-like humanoid, he is the accomplice of Rocket

Rocket - a genetically-engineered raccoon-based bounty hunter, mercenary, and master of weapons and battle tactics.

More Info: en.wikipedia.org