Tonight’s FBI Season 7 finale promises not just a high-stakes ending, but also a completely unexpected crossover that could rattle the Bureau to its core. With fans already emotional about the end of another gripping season, the final episode raises the stakes one more time—with a twist no one saw coming: Kevin Sussman, best known for playing awkward comic book store owner Stuart in The Big Bang Theory, makes his shocking debut in the FBI universe. But he’s not here to provide comic relief—he’s the key witness in a plot that threatens the lives of everyone at the FBI office.

CBS and Collider released an exclusive sneak peek ahead of the finale, revealing Sussman’s character being grilled by none other than Jubal Valentine (Jeremy Sisto), one of the show’s emotional anchors since the very beginning. In a rare moment of vulnerability, Jubal must walk the tightrope between interrogation and empathy, as the man across the table may be holding back information that could stop a looming attack—or make it worse.

Sussman’s appearance isn’t just a one-off surprise. His casting hints at a deeper connection between worlds: not only is he debuting in FBI, but he’s also slated to headline a brand-new series titled Stuart Saves the Universe, a spinoff set in The Big Bang Theory universe. The networks are staying tight-lipped about how these two timelines may or may not interact, but fan theories are already spiraling.

As the agents tackle the case at hand, the show also quietly celebrates a major milestone: 136 episodes of relentless cases, emotional reckonings, and powerful partnerships. Since the series’ debut in 2018, FBI has stood out as a modern procedural built not just on crime-solving, but on character. And tonight’s finale leans hard into both: adrenaline-pumping investigation and deeply human conflict.

Leading the core team are three stars who have stuck with the show through every episode—Missy Peregrym (Maggie Bell), Zeeko Zaki (Omar Adom “OA” Zidan), and Jeremy Sisto (Jubal Valentine). Their bond has evolved over years of shared trauma, moral dilemmas, and personal sacrifice. And now, with the new threat hanging over them, their resilience is tested like never before.

In the exclusive preview, Sussman’s character doesn’t come off as a typical criminal. Nervous, erratic, and possibly harboring PTSD, he claims to have information that could thwart an attack—but will the team believe him in time? Tension runs high as Maggie and OA dig deeper into his claims, uncovering inconsistencies that raise more questions than answers.

Meanwhile, the show takes time to honour its extended cast. Alana De La Garza, who portrays ASAC Isobel Castille, has become a fixture on the show with 115 episodes, just behind John Boyd (Stuart Scola) with 114. Both continue to offer a counterbalance to the core team—steady hands guiding from command, while still being emotionally involved in every decision.

The ensemble is rounded out by returning supporting players like Taylor Anthony Miller, Vedette Lim, James Chen, and Ebonee Noel—each of whom adds texture to the team’s dynamic and brings authenticity to the high-pressure world of federal investigations.

Created by procedural king Dick Wolf alongside Craig Turk, FBI has managed to remain fresh through layered storytelling, emotional realism, and a rotating door of intense cases. But it’s the emotional continuity between the agents—their secrets, loyalties, and wounds—that keeps fans invested season after season.

This finale, airing tonight at 8 PM ET on CBS, isn’t just a wrap-up—it’s a hinge point. With Season 8 already in production and Season 9 greenlit, the ending of Season 7 opens up new doors. Sources suggest that future episodes will see Maggie confronting demons from her past, OA reevaluating his role within the agency, and Jubal facing a personal decision that could shake the foundation of the team.

Streaming-wise, fans can revisit the full catalog of FBI on Paramount+, with select episodes from Seasons 4 and 7 also available for free on Pluto TV. For completists, digital platforms like Prime Video offer seasons for purchase—but considering the cost, streaming subscriptions may provide better value, especially with FBI: Most Wanted and FBI: International also available within the same ecosystem.

For now, though, the spotlight is on the finale: a confession, a potential bombshell, and the uneasy feeling that not everyone will walk away the same. Will Sussman’s character tell the truth in time? Will Maggie, OA, and Jubal be able to neutralize the threat without losing a part of themselves? And could this seemingly isolated episode plant the seed for something bigger—perhaps even a major crossover?

One thing’s for certain: FBI doesn’t end the season with a whisper. It ends with a shockwave.