'Legends of Tomorrow' season 3 episode 7 spoilers: Heroes face off with Gorilla Grodd

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A promotional image for The CW's "DC's Legends of Tomorrow."

In the next episode of "DC's Legends of Tomorrow," the Legends led by Sara Lance (Caity Lotz) go to Vietnam back in the 1970s to investigate gorilla sightings.

The trailer for the upcoming installment titled "Welcome to the Jungle" was recently released and showed Ray Palmer a.k.a. The Atom (Bradon Routh), Amaya Jiwe (Maisie Richardson-Sellers), and Zari Tomaz (Tala Ashe) surveying a camp in the jungles of Vietnam. "I thought we were looking for a monster," Tomaz says to the group. Soldiers are then shown walking through the moist greenery when one of them is flung through the air while the other watches in terror. He later warns the Legends to stay out of the jungle. However, the heroes later find out that the mysterious monster is actually Gorilla Grodd. Apparently, the enormous ape is an anachronism and travelled back to the 1970s.

It seems that Grodd has been busy forming his own militia composed of the locals in the area. One of his leaders appears in front of the crowd and rallies them to support the powerful ape. "One nation under Grodd!" she yells as the others follow in unison. Grodd is a telepathic gorilla who likes to gain power and authority over anyone. It never ends well for those who oppose him. It remains to be seen how the Legends will be able to stop his brutality.

In the last episode, the heroes went back to the 1930s during the height of American cinema to retrieve the historical figure Helen of Troy. They were able to save her from a group of corrupt movie producers and lead her to safety. The Legends were able to correct the timeline once again.

"DC's Legends of Tomorrow" season 3 episode 7 will hit the airwaves on Tuesday, Nov. 21 at 10 p.m. EST on The CW.