Gunn was let go in July 2018 after multiple offensive tweets resurfaced.
They claimed that the satiric tweets did not match the actions of their director.
Dedicated fans even started a petition trying to get Disney to rehire Gunn.
Gunn then moved to Warner Bros. and DC where he wrote the screenplay for, and is set to direct, The Suicide Squad — the sequel to 2016’s Suicide Squad.
It is tentatively scheduled for an Aug. 6, 2021 release.
Gunn tweeted about his excitement and appreciation on Friday afternoon.
Deadline has reported that Gunn had many meetings with Walt Disney Studios President Alan Horn to discuss the course of action.
After Gunn issued a public apology, Horn decided to reinstate the director.
Guardians of the Galaxy: Vol. 3 will resume production after Gunn wraps The Suicide Squad.
The first two installments grossed over US$1.6 billion worldwide and in a rare occurrence, the second movie made more than the first.
— With files from Adam Wallis