CBS has joined sibling CW in giving full-season orders to all of its fall series that have premiered so far: new dramas Scorpion, NCIS: New Orleans, Madam Secretary and Stalker. The orders for the CBS TV Studios-produced Scorpion, NCIS: New Orleans and Madam Secretary are for 9 more episodes, bringing the total to 22 episodes each. It is unclear if Warner Bros. TV’s Stalker also received a full Back 9 pickup.

Scorpion has been one of the surprises of this fall. Boosted by The Big Bang Theory at 8 PM, the new action drama has flourished in the Monday 9 PM slot. In fact, Scorpion is now the highest-rated CBS drama among adults 18-49, averaging a 4.5 rating in the demo in Live+7, and the second-highest-rated new series this fall behind ABC’s How To Get Away With Murder. Scorpion passed with flying colors its first test last Monday when it aired with a softer 8:30 PM lead-in from The Millers vs. Big Bang rerun. Its pickup comes on the eve of the freshman’s first airing tonight with no Big Bang as the hit comedy returns to Thursdays, to be replaced by 2 Broke Girls at 8 PM.

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CBS brass are happy with the performance of all four shows. NCIS: New Orleans has displayed better retention out of flagship NCIS than its predecessor in the Tuesday 9 PM slot, fellow NCIS spinoff NCIS: Los Angeles. NCIS: New Orleans and Scorpion also rank as the top two new fall series in total viewers, averaging 18.2 million and 15.2 million, respectively. Madam Secretary has been older skewing but packing viewership on Sundays, while Stalker has been improving its standing with a strong 56% DVR lift in Live+7. “These four shows have had an immediate impact on our schedule by improving nights, winning time periods and adding more hours of success across our primetime lineup,” said Nina Tassler, Chairman of CBS Entertainment.

The pickups of all four new CBS dramas makes the network’s inventory even tighter. CBS has three more dramas on tap for midseason: Battle Creek, CSI: Cyber and the seventh and likely final season of The Mentalist. One or more of these series likely will have to run over the summer. On the comedy front, the network’s only new entry this fall, The McCarthys, premieres this Thursday.

NCIS: New Orleans has averaged 18.16 million viewers, 2.8 in adults 18-49, according to Nielsen most current ratings through Oct. 19. It has improved its time period by +9% in viewers. Scott Bakula, Lucas Black, Zoe McLellan, CCH Pounder and Rob Kerkovich star. Gary Glasberg, Mark Harmon, Jeffrey Lieber and James Hayman are the executive producers for CBS Television Studios.

Scorpion is Monday’s most-watched drama, averaging 15.17 million viewers and a 3.6 in adults 18-49. The procedural has improved the year ago time period by 74% in viewers and 29% in adults 18-49. Elyes Gabel, Robert Patrick, Katharine McPhee, Eddie Kaye Thomas, Jadyn Wong and Ari Stidham star. Alex Kurtzman, Roberto Orci, Nick Santora, Nicholas Wootton, Justin Lin, Heather Kadin, Scooter Braun and Walter O’Brien are the executive producers for CBS Television Studios.

Madam Secretary is the most-watched scripted series on Sunday with 13.53 million viewers, a 45% time-period improvement. It averages 1.8 in adults 18-49. Téa Leoni, Tim Daly, Bebe Neuwirth, Željko Ivanek, Patina Miller, Erich Bergen, Geoffrey Arend, Kathrine Herzer, Evan Roe and Wallis-Currie Wood star. Madam Secretary is a CBS Television Studios production, in association with Revelations Entertainment. Barbara Hall is an executive producer with Revelations’ Lori McCreary and Morgan Freeman, and David Semel.