Shown in the 10pm hour, the premiere of ABC's seven-part series logged 4.3m (1.0), ranking lower in the slot than news programme Nightline which aired last summer.
Modern Family repeats were more popular at 9pm, amusing 3.8m (1.3) and 3.7m (1.3) with its double bill.
Though America's Got Talent slumped to 10.5m (2.8) from 9pm until 11pm, NBC still topped primetime ahead of Fox.
Coverage of the Olympic Trials helped the Peacock Network's cause, drawing a solid 7m (1.9) in the 8pm junction.
So You Think You Can Dance led the Murdoch Network's charge with 5.7m (2.0) between 8pm and 10pm.
CBS's Dogs in the City, which showed signs of recovery last week, fell back to 4.7m (0.9) at 8pm.