'Supergirl' season 2 spoilers: the good and bad sides of Superman's Metropolis City

A promotional image for "Supergirl" (Facebook/TheCWSupergirl)

Signing Superman up into a show means potentially bringing his sinister nemeses along for the ride.

A new set video shot by a fan in Vancouver, where the live-action superhero series, “Supergirl,” is currently filming, showed what looked to be the Man of Steel (Tyler Hoechlin) caught in an intense scuffle with a guy who seemed to be sporting a glowing chunk of green kryptonite on his chest.

ComicBook.com speculates this could well be John Corben, aka Metallo, the kryptonite-powered evil cyborg who was previously played by Brian Austin Green in the now defunct Superman origin series, “Smallville.”

No confirmation has been made yet, but if that really is Metallo in the video, the Kryptonian cousins are sure in for some major threats of cybernetically wicked proportions when “Supergirl” debuts its sophomore season on The CW this fall.

Meanwhile, more set photos have emerged in the past days showing bits and pieces of Superman’s very own Metropolis City. It has been reported earlier that Superman’s alter ego, Clark Kent, will be dropping by National City to visit his cousin, Kara Danvers (Melissa Benoist), in the first episode of “Supergirl” season 2. Now, it looks like Kara will also be paying a visit to her cousin’s home city in return.

The photos showcase the city’s finest, a police car, an ambulance, and a news van, all emblazoned with the proud Metropolis’ name, as well as its shadier corners in the form of the infamous Luthor Corp.

There is still no confirmation of “Superman” main villain Lex Luthor’s potential appearance, but recent casting news by TVLine suggest that the recurring role of his sister, Lena, has been given to “Merlin” alumnus Katie McGrath.

Lena Luthor reportedly comes to National City hoping to rebuild both her life and their family-owned tech company, Luthor Corp., after her brother Lex is put to prison. Whether she is going to be an ally or foe for the Girl of Steel is something that Supergirl herself will have to figure out as the series progresses.

Filming for “Supergirl” season 2 will continue from now until April 26 next year in Vancouver and British Columbia, according to filming locations archive, What’s Filming. This means that fans are in for more offseason news and surprises before “Supergirl” finally hits The CW on Oct. 10.