Oh, no, McAbby fans! There’s trouble on the way — and he’s huge.

Former NFLer Matthew Willig (pictured, center) makes his debut tonight on NCIS as Special Agent Simon Cade, an intimidating genius with an eye for Abby. ”There’s been some talk about a connection I may or may not have with Abby, and I think there’s something there,” he teases. “I’m a new agent in a new town and I’m looking for someone to show me around.” (Willig and fellow guest star Alimi Ballard’s arrival was first teased in Spoiler Room.)

And you can bet McGee “will definitely get jealous as time goes on,” Willig says.

“I think the dynamic that Abby and McGee have — they’re sort of in a stale spot. [Cade will] shake that up,” he tells EW. “There was just an instant attraction there with [Cade and Abby]. She’s friendly right off the bat, and there’s definitely a little connection we see.”

The only problem, according to Willig? He’s aware that McGee and Abby fans might not welcome his arrival, and the thought of disrupting a fandom as passionate as the McAbby group is enough to make even him squirm. “I’m paranoid. I may have to watch where I go out at night to make sure I don’t get followed,” he laughs.

What do you say, McAbby fans? Should Willig watch his back? Or are we excited to see McGee sweat it out?

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