E.J.'s team members are about to leave a very big impression on NCIS.

Seriously, we mean big. These individuals are not what you'd call small.

Former NFL player Matthew Willig debuts tomorrow as agent Simon Cade, an Ivy Leaguer with a brain that’s just as intimidating as his towering presence (he's 6'8").

Cade joins the NCIS team to help with the Port-to-Port killer case. Between his character’s photographic memory and 160 IQ, what's not to love? Well, Willig says ...

“The power struggle [between Gibbs and E.J.] is there for who’s in charge and who’s going to take over the case. Then to have a couple of other people, E.J.’s team, come in to fully attack the case makes it even harder for the regulars,” Willig says.

“As the episodes go on and the team gathers and the plot intensifies, there’s definitely a feeling of 'Wait, what’s going on? Are these guys are stealing our thunder?'" he tells EW.

"There’s that jealousy thing that starts to happen as the case unfolds.”

Not that Willig or fellow newcomer Alimi Ballard (above, left) are solely to blame. Why?

E.J.'s team and one of our favorite agents get off on the wrong foot, to say the least.

“[DiNozzo and Cade] have a fun and interesting opening scene. There are some items that sort of give away how big I am, and so there’s a little bit of comedy there."

"When I come in, he’s sort of fooling around with my clothing that kind of give away how big I’ll be. It’s all in typical [DiNozzo] fashion,” Willig says, laughing.

Before you start to put these guys in the “Do not like because they’re new” pile, Willig says fans might be surprised at the dynamic between Cade and his partner.

“We’ve traveled around the world and become buds. We watch each other’s back. Much like [the NCIS cast], we have that team aspect,” he says.

Tomorrow's episode, "Dead Reflection," airs at the usual 8 p.m. time slot, followed by an all-new episode of NCIS: Los Angeles, which was off last week.

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.