This a crossover between all Chicago Fire and NCIS LA, however the characters from Chicago MED and Chicago Fire may make an appearance.
Kelly Severide took Marty in when he was 11 which was during Season 1 of Chicago Fire. Now Marty is an adult, so the characters in the Chicago shows are much older as well and takes place years after the Chicago's
While all the Chicago's takes place in Chicago, for the purpose of this story all the Chicago has been changed to Los Angeles.
Leslie Shay didn't die in that building explosion.
Marine Lieutenant Diego Dawson is currently sitting at his desk doing paperwork. He had told his secretary that when NCIS gets there to send them in. There had been a murder and a fire in a storage room. Now NCIS is coming to investigate.
Diego looks up as he sees 2 guys enter.
"I am Agent Callen and this is Agent Hannah." G introduces.
Diego stands up and shakes both their hands.
"The fire burned up a storage room, after the fire was out we discovered the body." Diego explains.
"Has the fire been investigated for arson?" Sam asks.
"As of yet, no. We are leaving it up to you to take the lead. However, I do know an independent arson investigator if you want me to call them." Diego offers.
Callen nods and watch as Lt. Dawson dials a number, obviously from memory and listens in carefully on this one-sided conversation.
"Uncle Matt. It's Diego. I need you and Kelly to come down to the marine base to investigate a possible arson. Alright see you shortly. Just give your name and show your ID to the guard at the gate." Diego hangs up and calls down to the gate so they are aware.
"The investigator is your uncle. Does not exactly make it independent, does it?" Callen questions.
"No, I suppose not. But Kelly Severide is a licensed arson investigator and he has nothing to do with anyone on this base." Diego responded.
Callen and Sam leave the office to meet up with Kensi and Marty who happen to have been talking to the petty officer who had found the body. Diego comes out of the office and sees the 4 people huddled talking, all wearing a NCIS jacket. He sees the 2 he was just talking to, a pretty brunette and the 4th person he knows.
"Marty, you look good." Diego says as he walks up to hug him. "I lied, you look thin."
Sam, Kensi and Callen looked on wondering what is going on.
"You two know each other?" Callen asks.
Marty and Diego ignored him.
"Diego, I am fine." Marty answers annoyed.
"Have you spoken to Kelly, lately?"
"No, I've been busy and when I am available, he is on shift."
"Kelly and Matt are coming here to investigate the fire." Diego informs.
"Great," Marty mumbles.
"Deeks, what is going on?" Kensi asks pulling him away from the group.
"It is just got very far from independent." Diego comments to Callen and Sam.
"What do you mean by that?" Sam asks.
"While Kelly Severide is a licensed arson investigator and not connected to anyone on base is still true. However, he is Marty's adoptive dad." Diego explains.
"Deeks how do you know Marine Lt Diego Dawson." Kensi tries again away from the others.
Deeks does not answer. Kensi is about to try again when she hears.
"The Kelly who is coming to investigate the arson is my dad. He adopted me after my mother died and before that he was my foster dad." Deeks whispers.
Diego walks up to them with Callen and Sam following.
"Heads up Marty; they are here." Diego warns.
In walks 2 guys dressed in full firefighter gear with their gas masks in their hands.
"Diego, you called about investigating a fire?" Kelly asks.
"Yes. Kelly, Matt this is the team from NCIS. They are investigating the murder. NCIS this is Kelly Severide and Matt Casey." Diego introduces.
Kelly looks at the NCIS team and notices his son is there as well.
"Marty, long time no see. You are looking thin." Kelly comments as he pats him on the shoulder.
"Kelly, we came to do a job so let's do it as we are on shift." Matt intervenes.
Kelly and Matt approach the storage room the fire was in. As they got closer to the room they put on their oxygen helmets. Kelly walked around the room a few times shining his flash light at different area of the room. Matt helped when asked but mostly stood back and let Kelly work. Diego and the NCIS team stayed outside the storage area and observed.
"You do not have a murder on your hands, what you have is an idiot that is playing with fire or a martyr for the cause." Kelly announces as he comes out of the room.
"Why is that?" Callen asks.
"This was a chemical fire in a small enclosed place. It burned to hot and too fast for him to get out. Playing with fire, is dangerous enough as it is. Messing around with chemical fire is just plain stupid. If he was testing it out to see what the reaction would be, I don't believe that this is what he intended to happen."
Callen offers his hand out to Kelly, "Thank you.
Kelly shakes his hand and then goes to talk to his son.
"Marty, Gabby and Shay are going to love to see you. Are you able to make it to dinner tonight?"
Marty hesitates to answer.
"Actually, the invitation is open to all of you." Kelly tells the NCIS team.
"Sure, we would love to. What time is dinner?" Callen answers.
"Callen!" Marty exclaims.
"He invited me to dinner and I am going to go with or without you." Callen responds with a smile. Callen glared at Sam and Kensi daring them to agree with him.
"Sure, I'm in" Sam spoke up.
"Me too." Kensi agreed.
"So Kelly, it looks as if you guys have 3 dinner guest tonight." Callen pipes up.
Marty looks from his team to his dad. He can just imagine all the stories they will be told. He figures he might as well go to dinner too and act as a buffer between his team and his dad and dad's friends. But if the team is going to attend this dinner party he might as well open it up to everyone.
"I'll be there. But you better tell Gabby that it won't be 4 dinners guest, it will be six." Marty finally agrees.
Kensi looks at him trying to figure out who the other 2 are going to be.
"What, if you 3 are going. We might as well invite Eric and Nell." Marty replies.
The NCIS team nods.
"Great, dinner will be at 6:30. Oh and Marty, Shay and Gabby are going to want to give you a check-up." Kelly tells him.
Marty groans. That is what he gets for growing up around paramedics or ex-paramedics in this case since they are both retired.
"If you don't want them, I can always call up Dr. Halstead and have him come over to check you out." Kelly adds.
Marty shakes his head. Ever since Dr. Will Halstead treated him when he was admitted to the hospital after the shooting; he has been his personal physician.
"Is he still practicing?" Marty asks.
"I don't know, but I am sure that Antonio will know where to find him."
"No, don't go through all that trouble. Gabby and Leslie will do just fine at dinner tonight."
Matt's radio goes off alerting them to a fire.
"We will see, see you guys tonight." Kelly answers and leaves with Matt.
The NCIS team says goodbye to Diego and heads back to OPS.
"Did you guys really have to intrude on my family dinner?" Marty groans.