After the death of his mother when still a child, Peter Quill (Chris Pratt) encounters a change in the way that he views life. He is then kidnapped not long after and is forced into being brought up as both a thief and space adventurer whose life is constantly at risk due to him being responsible for stealing a mysterious orb. An orb that, unbeknown to him, is worth everything to so many people across the universe.
His problem is that many individuals in the universe are aware of the orb and are actively seeking it even though only a small number fully understand its actual power and capabilities. The main enemy is Ronan who believes that the orb belongs to him leading to Quill being forced into evading him at every opportunity. Eventually, Quill discovers the true power of this object resulting in him being forced into bringing together enemies in order to protect the entire universe and to stop the orb from falling into the wrong hands that would put everybody at risk.
Quill has to make a number of tough decisions including reaching a conclusion as to who he can and cannot trust. He finds himself casting doubt upon himself after encountering four other misfits including an individual who is obsessed with guns called Rocket Raccoon, a tree like human called Groot, an individual called Gamora who is enigmatic, and finally Drax the Destroyer who is fixated on vengeance.
Between the five of them they are left with the task of guarding the galaxy with everything resting on their shoulders. Five individuals that need to learn how to work together for the greater good and put their own differences to one side. Life was certainly easier before the orb.