Frank (Joseph Gordon-Levitt) is a New Orleans cop working to take down the corrupt Téleios. In order to catch an armed robber hopped up on power, he has to take a pill of his own. Luckily his power is being bulletproof, as we see when the robber shoots him point blank in the face. Despite losing consciousness for a moment, he's able to walk away with little more than a bruised face.
We also get a glimpse of what looks like super strength as he makes a dent in the street when taking down the bad guy. However, this may be a side affect of his armor-like skin. While Biggie (Rodrigo Santoro) is giving his talk on power, there's a shot of an armadillo which suggests that Frank's power has roots in the armored animal.