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Kim Coles makes her first series appearance as Mary Thomas, a sassy, outspoken African American woman who subs for the vacationing Roz (Peri Gilpin) as producer and call-screener for Frasier's radio call-in show. Mary's uninhibited demeanor and down-to-earth advice plays quite well with the listeners -- too well for Frasier (Kelsey Grammer), who fears that Mary may end up taking over his show...but he is equally fearful of complaining about it. Elsewhere, nerdy Niles (David Hyde Pierce) hopes to master the manly art of kickboxing -- with disastrous results for Daphne (Jane Leeves).