We've seen Chicago Fire and Chicago P.D. crossover plenty of times before but things will go a bit differently when both shows stage a major crossover beginning on March 7.

In addition to ringing in P.D.'s milestone 100th episode, the two-night event will be more involved than ever with characters who don't usually cross paths finally snagging some coveted onscreen time together. "There are lots of crossovers and conversations and scenes with people that you might not [normally] see," P.D. boss Rick Eid tells TV Guide.

Among them is the unusual team-up of P.D.'s Voight (Jason Beghe) and Fire's Boden (Eamonn Walker), who somehow find themselves holed up together in a surveillance van. Plus, Upton (Tracy Spiridakos) and Burgess (Tracy Spiridakos), who rarely have scenes alone together, will finally hit the streets as partners. And for those dying to see Brett (Kara Killmer) and Antonio (Jon Seda) reunite, you're going to get your wish.

" I know we do these little crossovers," added Fire showrunner Derek Haas. "Here's your big, two-hour, all-the-characters-are-involved crossover."

Chicago PD's hour will focus on a journalist who seeks revenge on the person spreading lies about him on the internet, forcing the Intelligence crew to step in. This leads to Chicago Fire's episode which finds Dawson (Monica Raymund) and Brett going undercover as Voight and Antonio track down a bombing suspect. With both episodes opting for a more cohesive story as opposed to a traditional hand-off, not every scene will correspond with their respective show.

"There's a scene within [Chicago Fire's] episode that doesn't have any Fire characters in it. It's P.D. scenes," Haas explains.

The two-night crossover event begins with Chicago P.D. on Wednesday, March 7 at 10/9c on NBC followed by Chicago Fire on Thursday, March 8 at 10/9c. Plus, Chicago Med airs Tuesdays at 10/9c on NBC.

Jon Seda, Kara Killmer; Chicago FireJon Seda, Kara Killmer; Chicago Fire