"Just Drive the Truck"

Episode 3 starts with firehouse 51 getting a fire alert. On their way to the fire they notice another fire truck going to the same fire, the other fire truck is Welch's. Cruz wanted to be the first truck on the scene so the trucks race to the scene. Casey tells Cruz to just forget about it and drive. Cruz was about to forget it and just drive until another firefighter said that if the other truck beats them to the scene they will have to take orders from Welch. So Cruz races on, which leads to the two fire trucks colliding. Cruz didn't know what had happened, he says they came out of nowhere. Welch's team said Cruz blew the light. Mills is helping get the driver of Welch's truck out when all of a sudden he falls over. 

Cruz was taken to the side to take a breathalyzer while in the middle of helping to get people out of the other truck. 

Mouch can't see, he has a lot of debris in his eye, luckily the injury didn't penetrate, he'll be okay. 

There's a guy injured in Welch's truck named Molina who is Welch's best friend, that guy is raced to the hospital, he is unconscious and unresponsive. 

Serveride is worried about Mills, who admits he has been getting dizzy since the building collapse and blames the pain meds he's been taking. Severide tells Mills he should get checked before next shift. 

Boden tells Casey that Dawson could be a candidate on truck 81 in Firehouse 51, the catch is Casey and Dawson cannot get married... When Casey tells Dawson she is excited but she doesn't know the catch. Dawson and Casey later talk about what working together means to their future. Dawson tells Boden later that Casey and her are serious about the opportunity. 

Mouch gets annoyed when Cruz didn't look at all the particulars when he suggested they open a food truck for Molly's. 

Mills had a major bruise on the side of his body, he learns he has PVVB and equilibrium problem, and he can't be cleared to go back to truck. Mills goes to see his grandfather, who says Mills looks like his mother. 

Cruz refuses legal counsel because he says the light was either green or yellow, NOT red, but if Melina doesn't wake up Cruz will be charged with man slauter. Cruz' duties are suspended until the case is cleared, Otis is driving truck until Cruz is back. 

While at the hospital with all the guys from both trucks Hermann offers to host something at Molly's for Molina and his family. While at Molly's later Dawson decides to tell everyone her and Casey are splitting up, because she's going to be on the truck, everyone cheers for her. 

Then Hermann announces that he got a call and Molina is awake and talking! 

Newhouse decides he wants a cut on the Molly's truck in return for giving them a truck to use. 

At the hospital Molina comes clean! He tells the Chief that Welch gave him the nod to get to the scene come hell or high water, which means no matter what! So in the end Cruz is off the hook. 

Once Casey tells the Chief they want Dawson on truck 81, Mills realizes there is an opening for a paramedic and he wants to fill the spot.