Or rather, to the Edge, as Heroes and Agents of S.H.I.E.L.D. star Adrian Pasdar is joining the cast for Season 3 -- as just announced at the show's San Diego Comic-Con panel. [...] not only that: three more folks are rounding out the guest star cast, some with some deep ties to comics continuity. First up is the aforementioned Pasdar, who will be playing ruthless real estate developer Morgan Edge. On the side of good (maybe), and further testing the theory that J'onn J'onnz (David Harewood) is the last martian alive, Carl Lumbly will appear as J'onn's father M'yrnn. Since Supergirl is no stranger to stunt casting -- having previously featured at least one prior Supergirl, a former Wonder Woman, and our second favorite Superman -- DC comics fans may recognize Lumbly as the voice of J'onn from the Justice League animated series.