CBS has released the Live+3 ratings for the Supergirl series premiere, giving a fuller sense for how many people watched the show -- and taking on an extra 3 million viewers in doing so. Live+3 takes account of live viewers plus the three days following on DVR.
DVR rose the show by 3.17 million viewers to a total of 16.13 million. That three-day period also rose Supergirl to a 4.1 rating in Adults 18-49.
For context, the premiere for Marvel's Agents of S.H.I.E.L.D. was considered a massive success for ABC, and it had almost identical numbers. Its live numbers were marginally smaller than Supergirl's, and the Live+3 for Supergirl were outperformed by S.H.I.E.L.D. slightly. Agents of S.H.I.E.L.D. went up from 12.1 million to 15.8 million.
Part of the significant rise in Live+3 could be because Supergirl is competing against Gotham, meaning that the comics audience is divided and some people have to catch up on Supergirl the next day or so, but when Agents of S.H.I.E.L.D. debuted, it didn't have such competition and simiarly rose. That said, both Supergirl and S.H.I.E.L.D. significantly outperformed Gotham in their respective series premieres. Gotham debuted at 8.3 million Live + Same Day viewers, with 14.1 million by the end of their first Live + 7 measurement period. Ultimately, Gotham does remarkably well in the thirty-day period that tracks streaming and on-demand purchases, reaching more than 20 million in its premiere and routinely picking up 12-15 million after that.
Supergirl was one of the two highest-rated new drama launches for Fall 2015, with the other being Blindspot, also executive produced by Supergirl and The Flash honcho Greg Berlanti.