The Hollywood Reporter wasn't wrong when the outlet reported that Thor: Love and Thunder would have “an Avengers 5 feel,” considering all the characters that have been slowly confirmed to be joining the cast. Even Tessa Thompson hinted at this expanded and familiar cast when she said that “some folks potentially from other pockets of the MCU” would be showing up in Thor's fourth outing.
Thus far, it has been apparent through arrivals to the Love and Thunder set in Australia that Chris Pratt's Peter Quill, Pom Klementieff's Mantis, Dave Bautista's Drax, and Karen Gillan's Nebula would be joining the film. Only Pratt has been outright confirmed to be starring alongside Chris Hemsworth, but Gillan has now confirmed her involvement in a recent post on social media.
Karen Gillan has confirmed through Instagram stories (via Digital Spy) that her joining Thor: Love and Thunder as Nebula is the “Real deal!” when asked about whether she was wearing another wig for the role.
"This is my hair, I cut it the other day in preparation for Nebula so that we don't have to get so much hair into the bald cap because I have so much hair. It's unbelievable, like, it's just so thick."
WHAT THIS MEANS
Essentially every member of the Guardians is now confirmed for Thor: Love and Thunder besides Bradley Cooper's Rocket Raccoon. However, Cooper can provide the voice easily enough off-site in a completely different country and James Gunn's brother Sean Gunn was also seen arriving in Australia.
The younger Gunn has provided the motion capture for all of Rocket's appearances in the MCU up to this point, so fans should expect news of Rocket joining the cast soon. If Vin Diesel is indeed there for Groot, then his feral father figure shouldn't be too far behind.
What role these band of former criminals will play in Thor: Love and Thunder is anyone's guess, since the movie was initially pitched to fans at San Diego Comic-Con as the reintroduction of Natalie Portman's Jane Foster and Tessa Thompson's Valkyrie being in search of a queen, after being made King of New Asgard at the end of Avengers: Endgame.
It likely has to do with the villain Gorr possibly being too much for Thor and his allies alone, hence the extra help from the Guardians of the Galaxy.