Former recurring actress Ming-Na returns to the series as a regular in the role of Dr. Deb Chen, who had given Carter (Noah Wyle) quite a run for his money during their intern days. Elsewhere, Kovac (Goran Visnjic) treats two brothers (Brian Hooks, Andre Fogenay Wilson), both of whom have apparently been abandoned by their parents -- and one of whom is mentally challenged. Finch (Michael Michele) takes care of a manically overachieving high school athlete (Gabrielle Union). And Greene (Anthony Edwards) flies to San Diego in search of his irascible father (John Cullum), who has "escaped" from his retirement home. ~ Hal Erickson, Rovi