S9, E13: Pratt is overwhelmed when his developmentally disabled brother, Leon (recurring guest star Marcello Thedford), persuades him to treat a gravely wounded robber who duped Leon into participating in a crime. Carter stuns Abby by deciding to go to Africa, where the medical needs are greatest. Meanwhile, Carter attends to the sickly Dr. McNulty (recurring guest star Ed Asner), the curmudgeon he recently met who runs a storefront medical clinic. Emotionally fragile Romano receives negative news regarding his recovery. Kovac's relationship with Weaver deteriorates, culminating in a threat from Kovac. Weaver's former patient, influential alderman John Bright (recurring guest star Bruce Weitz), returns bearing financial gifts of gratitude. And a bold doctor, "Fast" Edward Dorset (Bruno Campos - "Jesse"), startles Corday by asking her on a date.