At the Smith house, the Smith family are packing for a week long vacation
Francine: Oh this is going to be the best vacation ever.
Hayley: You sure it's okay for Roger to come along?
Stan: Yeah. He'll have his disguise on.
Roger: Yeah relax Hayley.
Klaus: I can't wait til we get to our spot.
Stan: Sorry Klaus you can't come.
Klaus: Why not?
Steve: You're staying with Jeff.
Jeff: Yeah.
Klaus: Why do you guys hate me?
Jeff takes Klaus with him
Francine: Are we all packed and ready to go?
Hayley: I got everything.
Steve: Me too.
Roger: All my wigs and outfits are packed.
Stan: Well time to go.
They get in Stan's car and drives off
We now to to Springfield at The Simpsons's house, the kids come in from school
Marge: Hey kids how was school?
Lisa: I got an A+ on my math test.
Marge: That's great. Bart what about you?
Bart: I got a D on my science exam.
Marge: A D. That's not too bad.
Bart: Everyone was shocked about it.
Homer walks in
Homer: Hey I'm home from work.
Marge: Hi Homie. How was work?
Homer: Oh the usual.
Marge: I made pork chops.
Lisa: Dad Bart got a D on a test.
Homer: A D? That's almost a C. You're starting to improve.
Bart: I'm shocked too.
Marge: Well let's eat.
Maggie sucks on her pacifier
We now cut back to the Smiths
Hayley: I feel bad that we didn't bring Klaus with us. But then again. Who cares.
Francine: Hayley?
Steve: You don't think Jeff is abusing him do you?
Stan: Hey we could have send him to Barry.
Roger: Then he would have been abused.
Stan's engine starts buffering
Stan: Aw shit!
Francine: What's wrong?
Stan: Our car broke down.
Steve: Where are we?
Roger: Some city named Springfield.
Hayley: What state?
Francine: Unfortunately we're not allowed to say the state.
Stan: We can go to that house for help.
They go up and knock on The Simpsons door
Marge: Hi can I help you people?
Francine: Yeah hi our car just broke down.
Marge: Aw that's terrible. I'll call a tow truck.
Stan: Thanks. I'm Stan Smith. This is my wife Francine, my son Steve, our daughter Hayley, and my nephew Roger.
Francine: Hello.
Marge: I'm Marge Simpson. Please come in. This is my family Homer, Lisa, Bart, and Maggie.
Homer: What's going on?
Marge: Their car broke down.
Lisa: That's terrible.
Roger: Is it cool if we stay here?
Marge: Of course. Steve you will be in Bart's room. Hayley you will stay in Lisa's room and Roger you will stay down stairs.
Roger: I usually sleep in the attic.
Homer: Well then you'll stay in the attic.
Stan: Thanks for letting us stay here.
Francine: I guess we can have our vacation here.
Marge: This isn't the first time we had something like this happen.
Bart: We had Family Guy stay with us for a while.
Lisa: That was because that weird old guy stole the Griffin's car.
Homer: Good times.
Stan: This is a cool place you got here.
Marge: Why thank you.
Santa's Little Helper appears and licks Steve
Steve: Who's this lovely dog?
Lisa: That's our dog. Santa's Little Helper.
Hayley: Aw he's so cute.
Roger: Where'd you get him?
Bart: We got him on the pilot of our show. Back in 1989.
Homer explains the events of the pilot to the Smiths
Francine: That's a terrible thing to do to a dog.
Stan: Yeah that's bullshit.
Homer: So ever since then, we had him.
Steve: We would have done the same thing.
Stan: I would have had the CIA killed him.
Marge: You work for the CIA?
Stan: Indeed I do.
Lisa: What's that like?
Stan: Oh it's fun.
Francine: I worked there with him for a little bit.
Stan: Until an accident happened.
Homer: I work at a nuclear plant.
3 hours later, the family are in the rooms they're supposed to be
Bart: Hey Steve you want to make some prank phone calls?
Steve: Sure.
Bart dials Moe's Tavern
Moe: Moe's Tavern.
Bart: Yes I'm looking for a Mr. Rotch. First name Mike.
Moe: Just a sec. Hey Mike Rotch. I'm looking for my crotch.
Everyone starts laughing
Lenny: You better look for it.
Moe: Oh when I found out who this is, I'm going to tangle my cord around your fat neck!
Bart hangs up and he and Steve start laughing
Steve: Oh that was funny.
Just then Sideshow Bob breaks in
Bart: AHHH! SIDESHOW BOB!
Sideshow Bob uses bobby pins and knocks out Bart and Steve
Sideshow Bob: I can't believe that worked.
Sideshow Bob drags Bart and Steve into his car and leaves a note
Lisa goes to Bart's room
Lisa: Bart, Steve it's time to wake up.
Silence
Lisa: Hello?
Lisa walks in and sees the note and screams
Homer: Lisa what's wrong?
Lisa: Sideshow Bob kidnapped Bart and Steve.
Stan: WHAT?
Marge: My special little guy?
Homer: Shit!
Francine: Who's Sideshow Bob?
Lisa: A manic.
The Simpsons explain about Sideshow Bob
Roger: He literally framed a clown?
Marge: Indeed.
Francine: My son's been kidnapped by a lunatic.
Lisa: We got to save them.
Homer: But we don't know where they are.
Stan: Relax I put a tracking device on Steve.
Marge: You think you'll find them?
Francine: I hope so.
Stan gets the location
Stan: They're 10 miles away.
Homer: Let's go.
Hayley: Steve please okay.
Steve and Bart wake up as they're trapped down a 50 feet wishing well in Sideshow Bob's basement
Steve: Where are we?
Bart: I have no idea.
Sideshow Bob walks down
Sideshow Bob: Well look who woke up.
Bart: Let us out of here Sideshow Bob!
Sideshow Bob: Okay.
Steve: Really?
Sideshow Bob: NO! I will never let you out of that well.
Sideshow Bob walks away
Steve: Who is that guy?
Bart: Sideshow Bob. He's a big psycho lunatic. He framed Krusty the Clown which got him arrested. When I exposed Bob, he got arrested and threatened me by saying he'll get revenge. He's been after me for 30 years.
Steve: Since 1990?
Bart: That's when he debut on my show.
Steve: Damn.
Bart: I doubt my family noticed that we're gone since we're the geeks of our shows.
Steve: My dad put a tracking device on me. He got it from the CIA. I felt it beeping so they're probably tracking us down.
Bart: You think so?
Steve: I'm sure of it.
Back with the rest of the Smith and Simpson family
Marge: Sideshow Bob better not kill Bart. He's too young to die.
Homer: When will he learn that he's never going to kill us. He always gets arrested.
Hayley: Dad how close are we to Steve and Bart's location?
Stan: We're just 6 more miles.
Lisa: Can't we go any faster?
Francine: Yeah our baby could be dead.
Stan: I'm going as fast as I can.
Roger: So that Sideshow Bob guy framed a clown, got the clown arrested, Bart exposed him which got him arrested and now he wants revenge?
Homer: Pretty much.
Lisa: Sideshow Bob is pretty much the main antagonist of our show.
Marge: One of the main antagonists.
Francine: I'm going to kill him for kidnapping my baby.
Lisa: Speaking of babies, who's watching Maggie?
Grandpa is holding a bag of sugar thinking it's Maggie
Abe: Who's a little cutie pie?
Maggie: (sucks on pacifier)
Now we cut back to the Smiths and Simpsons
Francine: I'm so worried.
Roger: Francine relax.
Lisa: Yeah this isn't the first time Sideshow Bob has kidnapped Bart.
Mare: We'll find them and beat the living shit out of Sideshow Bob.
Stan: Oh we're just 3 miles away.
Francine: Hang in there Steven.
Back with Bart and Steve, Steve is trying to get out of the well but it's too deep for him to climb out
Bart: Forget it Steve. The well is way too deep.
Steve: Where are we supposed to go to the bathroom at?
Bart picks up a jar
Bart: I think he wants us to pee in this.
Steve: Gross.
Sideshow Bob walks right back down and looks down the well and throws pizza down there
Sideshow Bob: I thought you might need some food.
They look at the pizza and sees anchovies on it
Bart: Ew anchovies.
Steve: Gross.
Sideshow Bob laughs evilly
Sideshow Bob: Have fun eating fish pizza.
Bart: You know my family is going to be coming to look for me.
Steve: Mine too!
Sideshow Bob: Oh really? It's been 15 hours since I've kidnapped you two. I don't think they will be coming to rescue you two.
Homer: THINK AGAIN BOB!
Sideshow Bob: Well the Simpsons family.
Francine: Let our sons go right now!
Sideshow Bob: NO! I WILL NEVER LET THEM GO!
Homer: You leave us no other choice.
Stan: Gem em!
Stan and Homer start kicking Sideshow Bob's ass
Stan: This is for kidnapping my son!
Homer: This is for trying to kill my son and our whole family!
Stan begins to use his taser on Sideshow Bob
Sideshow Bob: Ow!
Stan: You deserve that!
Homer: And this!
Home begins to strangle Sideshow Bob has hard as he can which kills him
Hayley: Whoa you killed him.
Marge: Bart. Are you okay?
Bart: Yeah.
Francine: Steve are you okay?
Steve: Yes.
Bart: Can you let us out.
Roger: On it.
Roger throws down a rope and frees Bart and Steve
Lisa: Thank goodness you're okay.
Hayley: Did he hurt you?
Steve: He shot bobby pins at us.
Bart: Dad did you kill him?
Homer: Yep.
Bart: Good.
Stan: Now let's get out of here.
Back at The Simpsons house
Francine: Well this has been a great family vacation.
Roger: Yeah.
Hayley: Even though we didn't plan for this to happen, I had fun.
Homer: Well we're glad we had you over.
Marge: And for saving my son.
Bart: You guys are amazing.
Lisa: We're going to start watching your show a lot more.
Stan takes out his phone and sets a timer
Stan: Best vacation on 3. 1, 2, 3.
Everyone: Best vacation ever!
Stan takes the picture and it comes out great
Gracie Films Lady: Shh!
Stan: And now the show is over now.
Note: This is my first ever crossover of The Simpsons but my second crossover for American Dad
Note #2: Now despite the title, it has nothing to do with the dads at all. It's just a combination name for The Simpsons and American Dad
Note #3: The Simpsons mention on how they had the Griffins lived with them for a little while is a reference to the Family Guy Simpsons crossover episode The Simpsons Guy
Note #4: The events of the series premiere of The Simpsons is mentioned where The Simpsons explain on how they got Santa's Little Helper
Note #5: Francine mentioning on how she worked at the CIA for a little bit is a reference to the American Dad episode Flirting with Disaster
Note #6: Bart breaks the 4th wall by saying on how Sideshow Bob has been after him for 30 years which is a reference to when Sideshow Bob debuted on The Simpsons in 1990
Note #7: Bart also explains the events of Sideshow Bob's debut episode on how he tried to frame Krusty the Clown
Note #8: Klaus and Jeff have extremely minor roles since they only appear at the beginning
Note #9: If anyone seems a little bit out of character, I'm sorry
Note #10: I might make more Simpsons crossovers. You just not might know on when they will come out