The latest details and possible spoilers for "Supergirl" season 2 will feature Cyborg Superman as the main villain and Superman visiting National City.
A new trailer for "Supergirl" season 2 will feature the team-up between the Kryptonian cousins, Kara Zor-El/ Supergirl (Melissa Benoist) and Kal-El/Superman (Tyler Hoechlin) as the video sees them stopping a space shuttle and landing it safely to the ground.
Supergirl expressed her excitement teaming-up with her cousin as Superman will be sticking around National City as both is heroic persona and his earth name Clark Kent. Several characters such as Jimmy Olsen (Mechad Brooks), Winn Schott (Jeremy Jordan), Alex Danvers (Chyler Leigh) and Cat Grant (Calista Flockhart) will be interacting with Clark as both reporter and hero.
The trailer also introduces Lena Luthor (Katie McGrath), the sister of Lex Luthor and is the current head of Luthor Corp after his brother has been incarcerated thanks to Superman.
Executive producer Andrew Kreisberg revealed the reason for Superman's appearance in "Supergirl" season 2 as he told TVLine that Cadmus will introduce "a chain of events" that forces Kara to seek help from her more experience cousin.
Project Cadmus is a research program that is tied the DEO (Department of Extra-Normal Operations) and has been researching and experimenting on aliens. They are also holding Kara and Alex's father Jerimiah Danvers (Dean Cain) during the coarse of the show.
Superman in season 2 will serve as a mentor figure to Kara as the Man of Steel will teach her how to integrate both parts of her life as both normal civilian and a hero into one.
Previous reports revealed that Superman will be fighting one of his most formidable foes, Metallo due to a leaked footage from Twitter username Emily. The scene features Superman in a fight with Metallo as Clark was able to gain the upperhand against the cyborg villain.
Meanwhile, there are rumors making rounds regarding the possible "big bad" of season 2 as several fans speculated that Cyborg Superman will be main threat to Kara's life.
Fans theorized that Cyborg Superman's possible existence could be made by Project Cadmus and they will use Kara's adopted father Jeremiah Danvers as guinea pig for Cyborg Superman, Cinemablend reported.
Project Cadmus abducted Jerimiah Danvers after Martian Manhunter (David Harewood) and Alex Danvers found out that he is alive. Martian Hunter pretended to be Hank Henkshaw after he was killed and led the DEO at the same time looked after Jeremiah's daughters as he promised.
It is theorized that Hanks was not killed and Project Cadmus will somehow transfer his mind to Jeremiah and tranformed him into a weapon using alien technology.
"Supergirl" will air on Oct. 10 on the CW Network.