#OneChicago will return in the spring.

Creator and executive producer Dick Wolf said he thinks there will "definitely" be a four-way crossover between his three existing Chicago shows -- Fire, P.D. and Med -- and new spin-off Chicago Justice next year, after the latter premieres midseason.

"It'll be in the second half of the season because there's not much sense in having a four-way until Justice is on and people know who the characters are," Wolf told reporters Monday at the Television Critics Association fall previews. "Justice is very complicated to figure out because you would want the first season, especially, to end with the trial. So, it's a question of how intensely will a crossover story impact on all four shows. It may not be as totally integrated as the SVU crossover was last year. It's a little premature, but I think that there will definitely be a four-way sometime in the spring."

Catch up on all the latest news from TCA

Wolf also stressed that he and the shows' writers don't need to strain to come up with believable storylines to carry out these crossovers.

"An arson case [on Fire] could show up in Justice. Obviously, a P.D. case that's resolved could show up in Justice," he said. "And doctors, aside from a massive medical murderer or something ... you would have, for example, Oliver [Platt] become one of the go-to expert witnesses on psychiatry, much like Elizabeth Olivet was on Law & Order. ... I think the integration will be as seamless as they have been for the past three or four years now."

Everything you need to know about all the new fall shows

In fact, Wolf sees his Chicago casts as one unit so much that he has formally petitioned for the Screen Actors Guild Awards to consider all four shows as one ensemble for the drama ensemble award. (None of the Chicago casts have ever been nominated for that award, but the casts of Law & Order received nine nominations.)

Colin Donnell, Chicago MedColin Donnell, Chicago Med

"I have literally petitioned them to have all the Chicago shows to be nominated or put up for one ensemble for the [ensemble award]. I think that would be fascinating," he said. "The universe doesn't have supporting players. All these people carry stories on their own. I think it'll be interesting to have them be recognized as One Chicago.

"There was a polite response that it should be officially requested. We've done that and we're waiting for an answer."

Chicago Fire returns Tuesday, Oct. 11 at 10/9c on NBC. Chicago P.D. returns Wednesday, Sept. 21 at 10/9c. Chicago Med returns Thursday, Sept. 22 at 9/8c. Chicago Justice premieres midseason.