TV EXCLUSIVE: Chris O'Donnell on Why You Don't Mess With LL Cool J: 'He is a Force to Be Reckoned With' By Raphael Chestang 3:54 PM PDT, September 23, 2016 This video is unavailable because we were unable to load a message from our sponsors. If you are using ad-blocking software, please disable it and reload the page. 52:25EXCLUSIVE: Chris O'Donnell on Why You Don't Mess With LL Cool J01:20Noah Mills Weighs in on Returning for ‘NCIS: Hawaii’ Season 2 (E…06:48Mckenna Grace on Embracing Pop-Rock With New Single ‘You Ruined …03:36Watch Chris Rock Make Will Smith Joke After Dave Chappelle Tackl…08:00'Jurassic World': Bryce Dallas Howard and Chris Pratt on If 'Dom…04:20Jon and Kate Gosselin's Daughter Hannah Shares Why She Chose to …04:04Minnie Driver Reflects on Past Relationship With Matt Damon (Exc…03:18Rauw Alejandro on ‘Complicated’ Process of Collaborating With Gi…02:11David Oyelowo on Joining the 'Yellowstone' Universe With Bass Re…03:02'RHOBH's Kyle Richards on Reliving Dorit's Robbery and Fighting …01:50Joe Alwyn and Alison Oliver on Filming 'Conversations With Frien…03:32Jackée Harry Recalls Working With Tia and Tamera Mowry on ‘Siste…01:47Ewan McGregor on Reuniting Onscreen With Hayden Christensen in ‘…01:18Cardi B Sings Country Version of 'Money' With Jimmie Allen on 'C…03:30Rebecca Romijn Reflects on Marriage to John Stamos With Current …02:16Daniel Ricciardo on How to Get Home Safely With Heineken's 'When…02:31‘Top Gun: Maverick’: Jay Ellis on Meeting the Royals and Flying …02:47Mod Sun Dishes on Working With Avril Lavigne in 'Good Mourning' …03:16Nick Jonas on Singing to His Daughter as He’s Honored With the G… Season eight of NCIS: Los Angeles premieres on Sunday, and ET stopped by the set, where star Chris O'Donnell compared it to a family reunion. "The cast especially can, a lot of times, feel like your siblings," O'Donnell says. "There are days that you love each other and days that you hate each other." RELATED: 'NCIS: Los Angeles' Star Daniela Ruah Is Pregnant With Baby No. 2!Siblings are known to have the occasional scuffle, but no matter how much co-star LL Cool J (real name: James Todd Smith) feels like O'Donnell's brother, the two won't be going to toe to toe. "That dude is one of the strongest dudes you can ever run into, as we all know," O'Donnell points out. "Todd is a force to be reckoned with."But is that force strong enough to get O'Donnell to perform on LL's other show, Lip Sync Battle?WATCH: Michael Phelps, Simone Biles and Aly Raisman Make 'Lip Sync Battle's Live All-Star Show a Rio Reunion"I hope to get some of the guys from this show over there at some point," LL tells ET. "That would be a lot of fun."NCIS: Los Angeles returns to CBS on Sunday at 8:30 p.m. ET/PT. EXCLUSIVE: Idina Menzel Reacts to 'Frozen' Campaign for Elsa to Have a Girlfriend at Billboard Music Awards This video is unavailable because we were unable to load a message from our sponsors. If you are using ad-blocking software, please disable it and reload the page.