Weddings, Guest Stars and Explosions on NCIS/NCIS: LA Finale

"Till Death Do Us Part" -- Terrorism threatens to shake the foundations of the Navy and NCIS, when the team continues to be eluded by the newest member of the NCIS Most Wanted Wall. Meanwhile, Jimmy Palmer's destination wedding is impacted by the case, on the season finale of NCIS, Tuesday, May 15 (8:00-9:00 PM, ET/PT) on the CBS Television Network. Pictured left to right: Jamie Lee Curtis and Mark Harmon Photo: Richard Cartwright/CBS ©2012 CBS Broadcasting, Inc. All Rights Reserved.

It's finale season, which means a ramp up of explosions and shocking moments and the two NCISes don't disappoint.

In the season finale of NCIS  airing on Global on Wednesday at 8.00 et/pt the NCIS team sets off to Florida for the first ever wedding on the show.  Jimmy Palmer is marrying his girlfriend Brina, but when the team  has to confront terrorism at a shockingly dangerous level, Palmer's wedding is caught in the crossfire.

And as a reward for having this high tension drama we get Jamie Lee Curtis and Scott Wolf guest starring. Curtis reprises her role as Psychological Operations director Dr. Samantha Ryan.

Meanwhile over on the West coast, the 2-hour season finale of NCIS: LA promises the usual big, big blow ups! "There's a particularly amazing explosion in the second hour of the show," Executive producer Shane Brennan tells the Seattle Post. "The debris is real, the fire balls are real."

The shocking finale has Callen (Chris O'Donnell) up against The Chameleon, when it's revealed they have been playing into his plan the entire time. But unlike previous season finales, we won't be finding out bits and pieces of Callen's past. Tune in to Global on Wednesday starting at 9.00 et/pt.

Watch below for your sneak peek!