The CW has picked up four additional episodes of DC’s Legends of Tomorrow, bringing the series’ second season to 17 episodes. The network also needs to make pickup decisions on newbies Frequency and No Tomorrow, which both have been sluggish, but Frequency has showed more promise and appears more likely to get more episodes.

As a midseason entry last season, Legends of Tomorrow received a 13-episode renewal for a second season. Unlike Flash and Arrow, which spawned it, Legends Of Tomorrow is a team-up superhero show that was not envisioned to do full-season, 22-episode orders.

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The time-travel series has been one of the stronger ratings performers for the CW with steady deliveries and strong time-shifted viewing, averaging 2.3 million viewers and a 0.9 Adults 18-49 rating (most current). It has improved the Thursday 8 PM time period by +35% in viewers and +13% in 18-49  vs. last fall when The Vampire Diaries aired there.

The series, from Berlanti TV and Warner Bros. TV, stars Brandon Routh, Victor Garber, Arthur Darvill, Dominic Purcell, Caity Lotz, Franz Drameh, Nick Zano, Amy Pemberton, Matt Letscher and Maisie Richardson-Sellers. It was developed by Greg Berlanti, Marc Guggenheim, Andrew Kreisberg and Phil Klemmer who executive produce with Chris Fedak and Sarah Schechter.