While Rocket is in critical condition, Peter and company do some risky snooping through Rocket’s traumatic back story to figure out how to save his life and stop the man pursuing him, the High Evolutionary (Chukwudi Iwuji). A powerful god-figure, the High Evolutionary has genetically altered Rocket, other animals and even children to create a perfect race to inhabit his imagined utopia. (Yes, that’s another Nazi-coded villain for your Bingo card.) So much of “Guardians 3” seems to erupt from left field, most prominently the main story, which is driven by Rocket, even though the Guardians have mostly played second-string...