The "NCIS: LA" spinoff has assembled an impressive cast of TV drama veterans.

John Corbett, Kim Raver and Scott Grimes will appear in the "NCIS: LA" episode titled "Red," which will serve as a backdoor pilot. When a murder weapon in Idaho matches the one used in a national security case in LA, Callen and Sam join the NCIS: Red team, a mobile group of agents who live and work together as they travel around solving crimes.

The March 19 episode features "Grey's Anatomy" veteran Kim Raver as NCIS Special Agent Paris Summerskill, John Corbett of “Sex and the City” fame as Roy Haines and former "ER" actor Scott Grimes as NCIS Special Agent Dave Flynn.

The first part of the "NCIS: LA" spinoff backdoor pilot airs Tuesday, March 19 at 9 p.m. ET on CBS.

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  • "NCIS: Los Angeles" Spinoff

    Kim Raver as Paris

  • "NCIS: Los Angeles" Spinoff

    LL Cool J as Special Agent Sam Hanna), Miguel Ferrer as NCIS Assistant Director Owen Granger and Chris O'Donnell as Special Agent G. Callen

  • "NCIS: Los Angeles" Spinoff

    Chris O'Donnell as Special Agent G. Callen and Kim Raver as Paris

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    Chris O'Donnell as Special Agent G. Callen and Kim Raver as Paris

  • "NCIS: Los Angeles" Spinoff

    John Corbett as Roy

  • "NCIS: Los Angeles" Spinoff

    John Corbett as Roy, Kim Raver as Paris.

  • "NCIS: Los Angeles" Spinoff

    LL Cool J as Special Agent Sam Hanna, Gillian Alexy as Clare, Kim Raver as Paris, Scott Grimes as Dave, Miguel Ferrer as NCIS Assistant Director Owen Granger, Edwin Hodge as Kai and Chris O'Donnell as Special Agent G. Callen