A long-running reality show delivered its worst number ever in the key 18-49 demo, based on Nielsen overnights for Monday night. Meanwhile, a drama series on the same network — ABC — got off to a slow start.

TVbytheNumbers.com reports that ABC’s two-hour “The Bachelorette” mustered only a 1.7 average in viewers 18-49, losing two-tenths of a point from last week for an all-time series low. Leading out from it, the premiere of ABC’s drama series “Mistresses” managed only a 1.2 average.

NBC won the night, with its two-hour “The Voice” holding steady to last week to come in as the top show of the night by a wide margin, both in the 18-49 demo (3.2 average rating) and in total viewers (11.05 million). Leading out from “The Voice,” the season finale of “Revolution” ticked up one-tenth from last week’s installment to a 2.0 average.

CBS aired a night of repeat programming, finishing ahead of Fox’s mix of originals and reruns. Fox’s fresh installment of “The Goodwin Games” matched last week’s 0.6 average in adults 18-49, while the premiere of the Fox run for FX’s “Anger Management” failed to create much of a ratings bump, settling for a 0.7.

When the dust settled, the numbers for prime time overall showed NBC well ahead of the pack with a 2.8 average in the 18-49 demo, followed by ABC (1.5 average), Univision (1.4), CBS (0.9) and Fox (0.7). NBC also won total viewers handily, averaging 9.5 million to ABC’s 5.2 million, CBS’s 4.5 million, Univision’s 3.5 million and Fox’s 1.7 million.