New spoilers for 'Criminal Minds', Season 10 Episode 1 reveal that a new agent will join the BAU team. The team will welcome Kate Callahan, who will be played by Jennifer Love Hewitt.

The synopsis for the first episode of Season 10 reads, "The BAU team investigates a series of murders in Bakersfield, Calif., which have left the victims unidentifiable. Also, the team welcomes new agent Kate Callahan (The Client List's Jennifer Love Hewitt) into the BAU fold." Episode one is entitled, "X."

Callahan is supposed to be Blake's replacement. However, unlike Blake, Callahan does not have any history with anyone still on the team.

"The idea is that they've been down an agent all summer [and] they've been interviewing a lot of people, and Hotch meets with her and says, 'You got the gig,'" executive producer Erica Messer told TV Guide, "You're going to get to know her from the ground up and ... she won't remain a mystery."

Messer also said that fans should not expect any nostalgic scenes in this season like what they did with the previous "The Reaper" episode.

"We're going to be moving on to new, fresh mythologies," Messer said.