Mekhi Phifer isn't playing Roman on High Potential, so how does his character Arthur fit into season 2? During the Tuesday, September 23, episode of the hit ABC series, Morgan (Kaitlin Olson) was shown a photo of the man (Phifer) everyone assumed was Roman. She confirmed it wasn't her ex, and Phifer's character ultimately turned up again at the end where he told Morgan he was Roman's friend Arthur. High Potential star Judy Reyes exclusively teased to Us Weekly where Arthur's story goes from here, saying, "What I will say is Arthur exposes a history that he's had with Morgan.