The release of the trailer for James Gunn's Superman film has set the Internet abuzz, in no small part due to its vibrant cast composed of many underrated DC characters. One standout inclusion is a long time coming, with Edi Gathegi bringing DC Comics superstar Mister Terrific to life in his first appearance on the big screen.

The Superman trailer has generated a lot of discussion for its willingness to dip into DC's more obscure cast of characters, with Krypto the Super Dog, Green Lantern Guy Gardner, and Hawkgirl all given premier billing. The appearance of Mister Terrific near the trailer's end is a welcome surprise, as this marks his big-screen debut despite being a major player in DC Comics for decades.

Despite being relatively obscure outside the comics, Mister Terrific is a lynchpin character in the DC universe, serving as the backbone for many critical superhero organizations, like...