Penny Johnson Jerald (Sherry Palmer on 24) joins Castle as a series regular for Season 4 playing NYPD Police Captain Victoria Gates. Following the death in the Season 3 finale of Captain Roy Montgomery (Ruben Santiago-Hudson), she'll come to the station from Internal Affairs as his replacement.
With the nickname "Iron Gates," Gates is as by-the-book as they come, and she instantly has an issue with Castle - "He's not a cop, he doesn't belong."
In a riveting opening that picks up just moments after last season's climactic finale, Detective Beckett (Stana Katic) fights for her life as Castle (Nathan Fillion), plagued by guilt over his role in the events, struggles to uncover who's behind her brutal shooting.
Meanwhile, back at the precinct, Ryan (Seamus Dever) and Esposito (John Huertas) have to adjust, as Victoria "Iron" Gates (Johnson Jerald) becomes the precinct's new uncompromising Captain.
Castle stars Nathan Fillion (Firefly) and Stana Katic (Quantum of Solace). The series centers on the life of Richard Castle (Fillion), a famous mystery novelist and divorced father raising his teenage daughter, while being kept grounded by his Broadway diva mother.
He is creatively blocked until the NYPD questioned him in connection with a series of murders staged to imitate crime scenes from his books.
Castle finds inspiration in NYPD Detective Kate Beckett (Katic), a bright and aggressive homicide detective with a fascination for odd and offbeat cases stemming from the years-old unsolved murder of her own mother.
Though they instantly clash, sparks of another sort began to fly, leading both to danger and a hint of romance as Castle steps in to help find the copycat killer.
Once that initial case is solved, Castle and Beckett continue to investigate strange homicides in New York, combining Castle's writer intuition and Beckett's creative detective work.
Returning for Season 4 are Nathan Fillion as Richard Castle, Stana Katic as NYPD Detective Kate Beckett, Tamala Jones as Medical Examiner Lanie Parish, Jon Huertas as NYPD Detective Javier Esposito, Seamus Dever as NYPD Detective Kevin Ryan, Susan Sullivan as Martha Rodgers, and Molly Quinn as Alexis Castle.
Castle is produced by ABC Studios. Andrew Marlowe serves as executive producer/writer, along with executive producers Rob Bowman, Laurie Zaks, David Amann, and Armyan Bernstein.