TNT’s new series “Legends,” developed by “24” and “Homeland” producer Howard Gordon, opened to average numbers on Wednesday — though it should generate above-average VOD tune-in.

According to Nielsen “live plus same-day” estimates, “Legends” averaged a 0.52 rating in adults 18-49 (658,000 viewers in the demo) and 2.6 million viewers for its 9 p.m. telecast, and an 11 p.m. encore attracted about 1 million more total viewers.

TNT made the first episode available to subscribers through TV and broadband VOD for a week leading up to the premiere, so its overall numbers should spike.

The “live plus same-day” demo rating for “Legends” (0.52) puts it in about the middle of the pack for this summer’s cable drama premieres — below TNT’s two prior bows (a 1.18 for “The Last Ship” and a 0.64 for “Murder in the First”) but ahead of USA’s “Satisfaction” (0.49) and “Rush” (0.39) and others including Lifetime’s “The Lottery” (0.41) and AMC’s “Halt and Catch Fire” (0.34).

In total viewers, “The Last Ship” (5.33 million “live plus same-day” viewers) and “Murder in the First” (3.76 million) stand as summer’s two most-watched cable launches, and “Legends” cracks the top 10. While “Murder” faded before seeing a nice bounce for its finale, the former has remained a strong performer and is cable’s top new show of the summer in adults 25-54 and total viewers.

“Legends” stars Sean Bean as a deep-cover operative. It is adapted from Robert Littell’s novel.