LOS ANGELES - Viewers were eager to see ABC's reboot of "Roseanne," with an estimated 18.4 million tuning in to its debut.

The updated sitcom starring Roseanne Barr returned Tuesday, more than two decades after the original ended its hit run. The hour-long debut episode was watched by 10 per cent more viewers than saw the May 1997 finale of ABC's original "Roseanne."

That's impressive, given the explosion of alternate platforms and series since then and compared to other successful sitcom reboots.

NBC's "Will & Grace," for example, returned this season with its original 1998-2006 cast to a debut audience of 10.1 million viewers and was quickly renewed for a second and then a third season.

For its freshman year, NBC's show is averaging 5.7 million people watching episodes on the day they air. But with the time-shifting viewership that networks are focusing on, its audience averages 9 million per episode over a seven-day period.

Another promising sign for "Roseanne" was the estimated audience growth from the first half-hour (18 million) to the second (18.9 million), a sign that viewers liked what they saw. Future episodes are a half-hour, airing at 8 p.m. ET Tuesday on CTV in Canada.