By James Hibberd
Updated June 24, 2011 at 04:24 PM EDT
Credit: Gilles Mingasson/ABC

Mark Burnett’s new adventure competition series Expedition Impossible debuted as the top-rated show Thursday night.

Expedition benefited from a lack of competition during the evening, delivering a summer-solid 7 million viewers and a 2.3 rating among adults 18-49. That tied its lead-in Wipeout (7.5 million, 2.3) as the highest-rated show. The return of cop series Rookie Blue (5.9 million, 1.6) underperformed at 10 p.m.

Networks aired mostly repeats. Fox had So You Think You Can Dance (6.3 million, 1.9), down 14 percent this week. Also, NBC aired Love Bites (2 million, 0.8), down 20 percent.

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