For decades, Jimmy Olsen has been known as "Superman's Pal," the steadfast best buddy of the Man of Steel, only dipping his the in the world of battling crime in a costumed superhero role on rare occasions. And while the version played by Mechad Brooks on The CW's "Supergirl" has not been one to idly stand by and watch Kara Danvers leap into action while people are in danger, it's only recently that he's decided to take the next step and become pro-active rather than reactive.

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With Jimmy's new role as the Guardian just around the corner, CBR has the exclusive first look at the scene where he explains exactly why this is the time for him to make the leap from helper to full-fledged superhero.

"My whole life, I have been a sidekick," Jimmy explains to a confused Winn (Jeremy Jordan), coming clean about the mysterious origins of his recent spate of injuries. "I have hidden behind my camera while my best friends wear capes, and they're heroes, and they save people. And I want to do something good for the world."

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Check out the full scene above, and tun in to "Supergirl" tonight to see even more of Jimmy's metamorphosis from mild-mannered photojournalist to full-on costumed vigilante.

SUPERGIRL TAKES ON A RUTHLESS NEW GANG - Supergirl (Melissa Benoist) must beat a ruthless new gang who has been armed with dangerous new alien technology. When Cadmus sends a video to the DEO, the team realizes Cadmus is the one staffing the criminals for a secret mission. Meanwhile, Kara (Melissa Benoist) gets Mon-El (Chris Wood) a job as an intern at CatCo, James makes an important decision and Lena (Katie McGrath) invites Kara to attend one her fundraisers. Glen Winter directed the episode written by Gabriel Llanas & Anna Musky-Goldwyn (#205). Original airdate 11/7/2016.

Starring Melissa Benoist as the Girl of Steel, "Supergirl" airs Mondays at 8 pm ET/PT on The CW. The series also stars David Harewood as Martian Manhunter, Mehcad Brooks as Jimmy Olsen, Chyler Leigh as Alex Danvers and Jeremy Jordan as Winn Schott and features appearances by Calista Flockhart's Cat Grant as well as Tyler Hoechlin's Superman.