'9-1-1' and spinoff '9-1-1: Lone Star' both renewed and will have a crossover event next season

• "9-1-1" and its spinoff "9-1-1: Lone Star" will both return for new seasons, Fox announced today.
• In a pre-upfront presentation conference call, a Fox exec teased the two will have a crossover.
• "9-1-1" and "9-1-1: Lone Star" are the network's top two scripted series.

Fox's most successful franchise is going strong: "9-1-1" and its spinoff "9-1-1: Lone Star" will be back for seasons five and three respectively, the network confirmed on Monday.

Michael Thorn, the president of entertainment at Fox Entertainment, also teased during a pre-upfront presentation conference call with reporters that the new seasons of the two shows will include a crossover event of some kind.

"Spoiler alert: Keep an eye out for a crossover in the back half of the season," Thorn said.

This will mark the second crossover event in the shared "9-1-1" universe, according to The Wrap.

Interestingly, Fox is choosing to break up "9-1-1" and "Lone Star" at the start of the 2021-22 season, using "9-1-1" as a lead-in to a new fall show, "The Big Leap" instead. "9-1-1: Lone Star" will not return until midseason, at which point it's set to take over "9-1-1's" Monday 8 p.m. time slot.

Both shows currently air back-to-back on Mondays.

"9-1-1," which stars Angela Bassett and Peter Krause, follows a group of first responders, including paramedics and police officers, in Los Angeles, California. It will be back for a fifth season this fall.

Its Texas-focused spinoff (starring Rob Lowe and Gina Torres) with roughly the same premise, "9-1-1: Lone Star," will get a midseason premiere for its third outing.

The crossover would leave room for the two crews from Texas and California to meet and perhaps share a storyline.

Both "9-1-1" and "9-1-1: Lone Star" are created and produced by Ryan Murphy and Brad Falchuk, who are best known for creating "Glee" and "American Horror Story."

TV Line reports that "9-1-1" and its spinoff are the network's top two scripted dramas, respectively averaging 6.5 million total viewers and 5.5 million viewers going into their May 24 season finales.