Criminal Minds returns for its 10th season today, 1 October at 9pm on CBS.
Previously, the action-packed Season 9 second part finale ended with the departure of Alex Blake (Jeanne Tripplehorn) character from the show.
The premiere episode is titled X, and the synopsis reads:
Jennifer Love Hewitt joins the cast as FBI undercover agent Kate Callahan and Kerr Smith guest stars as Frank Cowles.
Showrunner Erica Messer told TVGuide, "Episode 10.1 airs on 10/1. How cool is that?
"It wasn't planned. We didn't know that until we started back up and we were well in the swing of things, and [CBS] mentioned that the premiere would be a little later than usual because of Extant and Survivor. So it's great timing."
Agent Kate Callahan's line of specialisation will be undercover operations.
Messer said: "You see [Kate] doing something you don't see our team ever doing, which is schmoozing with a bad guy, working undercover to take a pedophile down."
You can log on to the official website for broadcast details and to watch episodes online.
You can also click here to watch the premiere episode online via live stream.
Watch the promo here.
Here are a few tweets on the upcoming season premiere:
a little more than 14 hours until the new season of criminal minds im so !!!!
— savannah (@aleclightwow) October 1, 2014
Criminal Minds starts today !!! — Gamez Garcia ✨ . (@AyeeGee_x3) October 1, 2014
— Criminal Minds Fans (@BAU_United) October 1, 2014
Omfg it's criminal minds tonight #criminalminds
— ☻ Amy johnson ☻ (@staystrong4u5) October 1, 2014
Criminal Minds Season Premiere TONIGHT !!
— PieFace. (@DESStinee_) October 1, 2014