NBC is adding some scripted original inventory, ordering an extra episode each from its strongest drama series, freshman Blindspot and the Dick Wolf trio of Chicago Fire, Chicago P.D. and Law & Order: SVU. The four series’ seasons have now gone up from 22 to 23 episodes.

NBC Logo NewWhile expanded runs are standard practice for the Wolf procedurals — all owned by NBC– which often produce 24 episodes a season, the move is unusual for a first-year drama that has a dense mythology and/or comes from an outside studio, which is the case of the Warner Bros. TV-produced Blindspot. The previous breakout NBC dramas not owned by the network, WBTV’s heavily serialized Revolution and Sony TV’s The Blacklist, produced 20 and 22 episodes, respectively, in their first seasons.

NBC has new dramas Shades Of Blue, Heartbreaker and Game Of Silence on tap for midseason. Additionally, the latest addition to the Chicago franchise, Chicago Med, premieres November 17. The network also needs to make a decision on ordering back episodes of sophomore drama The Mysteries Of Laura.