Time travel has been all the rage on network television these days -- but is the genre revival actually paying off for broadcasters? The easy answer is "no, not really." But some are working better than others -- here's how all eight time-travel broadcast shows rank by Nielsen's "live" TV ratings among adults 18-49. Also Read: Inside ‘SNL’ Ratings Surge: Here’s How – and When – People Are Watching This Season

Rank: 1 (tie)Show: "The Flash"Network: The CWRating: 1.1 Also Read: 10 Lowest-Rated New Broadcast TV Series of 2016-2017 Season (Photos)

Rank: 1 (tie)Show: "Timeless"Network: NBCRating: 1.1 Also Read: Kelly Ripa Guest Co-Hosts Ranked by TV Ratings: From Jimmy Kimmel to ‘Walking Dead’ Star (Photos)

Rank: 3Show: "Once Upon a Time"Network: ABCRating: 1.0 Also Read: ‘Cash Me Outside’ Girl Helps ‘Dr Phil’ Cash in on Season-High Ratings

Rank: 4Show: "Making History"Network: FoxRating: 0.8* *Premiere only Also Read: Oscars Boost ABC to Biggest Weekly Ratings Win in 17 Years

Rank: 5Show: "DC's Legends of Tomorrow"Network: The CWRating: 0.7 Also Read: ‘Nashville’ TV Ratings: A Tale of 5 Seasons, 2 Channels and 1 Shocking Death

Rank: 6Show: "Time After Time"Network: ABCRating: 0.6* *Two-hour premiere only Also Read: Ratings: ABC’s ‘Time After Time’ May Soon Be History With These Nielsen Numbers

Rank: 7Show: "Sleepy Hollow"Network: FoxRating: 0.5 Also Read: Oscars Nab Nearly 33 Million Total Viewers

Rank: 8Show: FrequencyNetwork: The CWRating: 0.3 Also Read: 10 Highest-Rated New Broadcast TV Series of 2016-2017 Season (Photos)

Perhaps network executives should attempt to travel back in time to pass on some of these at the pilot stage. We'll find out soon enough what the future holds for the genre. Also Read: Trump Address: Fox News Soars 115 Percent in Viewers Over Obama’s First Turn