Oliver Stark, the actor who plays Buck on the hit ABC series 9-1-1 , just posted the biggest evidence yet that his series will be crossing over with the new spinoff 9-1-1: Nashville , which premieres Thursday, October 9. The scripted first responders drama isn't a stranger to crossovers, especially when the first spinoff, 9-1-1: Lone Star , was on the air.

9-1-1 also aired a crossover with another Ryan Murphy-created show, Doctor Odyssey .

Stark just shared content on Instagram that's continuing to feed into speculation about a 9-1-1 crossover. In an Instagram Story, he posed with four cast members from 9-1-1: Nashville : Juani Feliz, Hunter McVey, Michael Provost, Jessica Capshaw and Hailey Kilgore.

The actor added a caption that told his social media followers to

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