A rumor suggests that The Flash villain Gorilla Grodd will try to start World War III in a season 3 episode of Legends of Tomorrow that will take place during the Vietnam War.
It was confirmed in August that The Flash villain Gorilla Grodd will appear on Legends of Tomorrow.
Bleeding Cool reports that Gorilla Grodd will appear in episode 7, which will take place in Vietnam around 1967 or 1968.
All of this seems to indicate that the rumor about Gorilla Grodd in Vietnam is indeed true.