Frank is a Black Mesa security guard that accompanies Robbaz during his playthrough of the Half-Life Black Mesa mod.
Frank, along with fellow security guard Bill and female scientist Palin all appear in episode 3 of Robbaz' playthrough of Black Mesa Source. Frank is first met by Robbaz when his friend turned into a headcrab zombie and tried to attack him, but Robbaz intervened and saved him. After that encounter, Frank joined Robbaz and they both later met-up with Bill. Further on they found two scientists called Clifford and Palin. Palin joined them whilst Clifford stayed behind. Even later, they encountered a third security guard called Murphey.
Frank is a psychic, as noted by Robbaz, as he could tell how many bullets Robbaz had in his .357 Magnum.