The broadcast networks, during next week's upfronts, will unveil a collective slate of 104 new series, only a fraction of which will become enduring hits. Among the shows with the most potential, according to Horizon Media analyst Brad Adgate, are Fox's "Rake," starring Greg Kinnear; CBS' "Mom," from "Two and a Half Men" and "The Big Bang Theory" creator Chuck Lorre; and Michael J. Fox's new comedy series for NBC.

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