I hadn't thought about writing another story so soon, but today I woke up and this story suddenly occurred to me. According to me will be three chapters, but I always say the same and write more lol. Anyway, I hope you like it. Comments are always appreciated.

-Leonard, could you please pass me the sauce- Penny asked, pointing to the bag that was on the table.

-Of course- He leave the plate on his legs and look inside the bag- I think they forgot it.

-Well,- Penny shrugged. -I'll have to eat it like that.

- Good thing Sheldon is not here or we should hear him call the pizzeria to complain - everyone laughed at Howard's comment.

-I think I have a bit of sauce left. I'm going to look for her. -Leonard stood up and started walking toward the kitchen when suddenly a light appeared out of nowhere and blinded everyone for a few seconds.

-What the hell is that light?- Penny asked, covering her eyes.

-I don't know- Leonard answered from the floor as he had been scared and fallen to the floor- Are you all right?

-Yes-answered Howard and Raj in unison.

-What's going on here?- Said a very familiar voice.

-Sheldon? - Everyone finally could see well and they found that Sheldon was standing by the kitchen island- Did you provoke that horrible light?

-I think so ... -Sheldon turned around to see from one side to another- What are we doing here?

-What are we doing here? - Howard looked at him without understanding- What are you doing here? You were supposed to go out with your friend Amy.

-Amy is my friend?

-Well, that's what you say all the time.

-But ... -Sheldon looked at the strange clock in his hand. The had been spinning like crazy and suddenly understood everything- Oh no...

-What's the matter with you?- Penny asked. -You're acting weirder than usual.

-What year is?

-Okay, I think Sheldon finally went crazy,- said Howard.

-It's not time for jokes Wolowitz. What year are we in?

- In 2012- Leonard put a hand on his shoulder- Are you sure you're okay?

-Yes it's just that ... I can not believe it worked.

-What worked?

-I just went back in time-Raj who was drinking water spit it out.

-You've definitely gone crazy,- said Raj.

-I'm afraid time travel is impossible- Leonard grabbed his arm and started to take him to the room- I think you should rest.

-I'm not crazy or tired-he let go of Leonard and looked at his friends- I traveled 13 years in time.

-Do you really expect us to believe that you ...?- Penny began, but at that moment the apartment door opened and Sheldon and Amy entered through it.

-You will not believe what happened to us,- Sheldon said as he left his keys on the table next to the door, looked up and saw that all his friends seemed very surprised. -What happen to all of you?- Penny pointed to the opposite side of the room and Sheldon realized why everyone was so surprised.

-Why didn't you tell me you had a twin?- Amy asked, still at his side.

-No ... I don't have a twin,- He said, still looking at the man who looked so much like him. He grabs the sword of Game of Thrones that was next to the door to threaten the stranger- Who are you?

-Then it's true-Howard ignored the Sheldon who was at the door and looked at the other Sheldon still unable to believe it

-What is true? -asked Sheldon beginning to get angry- And who is this guy?

- I am your ... from the future - the Sheldon of the past opened his mouth to say something but a second later he fainted.

When Sheldon opened his eyes he was lying on the sofa and his friends were surrounding him but there was no sign of the other Sheldon.

-Are you okay?" Amy asked him and he nodded.

-What happened to me?- He said, sitting down in his place. -I swear I just had the weirdest dream of all. That I traveled in time and...

-I think I know how it all happened-said the Sheldon of the future appearing in the hall while the other Sheldon opened his eyes- I see that you're fine- smiled at the sight of his young version.

-Are you really from the future?- Asked the younger Sheldon standing up and the other Sheldon nodded." Proof it.

-Very well-Sheldon of the future turned to see everyone present- What do you want to know?

-I don't think it's a good idea-Leonard said and everyone looked at him- Anything he says about our future can change things.

- His single presence has already altered everything.

-Howard is right-everyone looked surprised at the Sheldon of the future- I know it sounds strange but in the future Howard and I agree on many things.

-I think that's even weirder than your presence here,- said Howard.

-Whatever. What do you want to know? Penny and Amy started asking many questions and Sheldon didn't understand any- One by one.

-Oh yes of course, sorry -said Amy- You start.

-Well it's quite obvious that you come from the future now that I realize- everyone looked at her surprised- What? You don't need to be so smart to notice that this Sheldon finally dresses up as an adult and not as a 10 year old child.

-I don't dress like a 10-year-old boy,- complained the younger Sheldon.

-It's true- Amy said looking at the checkered shirt and jeans of the other Sheldon.

- That he has other clothes doesn't prove that it comes from the future - said the other Sheldon.

-But he looks a little older-Amy looked at him carefully- How old are you?

-45 years old.

-You don't look like a 45-year-old," Penny said clearly surprised.

-They tell me the entire time-He look at their younger version- Now you believe me?

-I'm still not convinced.

-What day is today?

-May 24, 2012-answered Leonard.

-It's our ... your anniversary,- He said looking at Sheldon and Amy who were sitting together.

-Anniversary?- Amy frowned.

-Yes. It was the day we met in the cafeteria thanks to Raj and Howard.

-I was right. I don't know who you are but you're an impostor. Sheldon ran to the door and grabbed the sword again. Who are you and why are you here?

-Well, everyone is right. I was so exasperating -said looking at the other Sheldon- I told you I am you.

- Then why do you say that today is our anniversary? - Amy asked.

-Because it is! You and I met on May 24, 2010 after Raj and Howard blackmailed me with a dirty sock.

-We never did that-said Raj.

-Of course you did. We were on the roof doing experiments, I found the dirty sock and you-He point to Raj-you told me that you had hidden it somewhere in the apartment and that if I did not accept going to a date with Amy you would leave it here and you would not tell me where it was.

-The first part is true, but I got rid of the sock and never mention it again- answered Raj.

-Then how did you meet?- Asked the Sheldon of the future.

- I wanted to go to the presentation of the book of Dr. Brian Green but none wanted to accompany me so I went alone. After telling him that he should dedicate himself to something else, he asked me to leave so I did; Amy caught up with me and said that Dr. Green's attitude had been rude and that I was right. I invited her to the apartment that same day - the Sheldon of the future raised her eyebrows in surprise.

- You mean Amy and you...

-Amy and I what?

-I think he thinks you and I had coitus that night-Amy explained, blushing.

-Of course not. I find the idea of coitus as something ridiculous.

"At least that's still the same," said the Sheldon of the future. "For now.

-For now? What do you mean by that?

-Nothing Sheldon- turned to look at Leonard and Penny- Are you together?

-Of course not, we're just friends,- said Leonard.

-Really? -They both nodded- And don't you want to have beautiful and intelligent babies with Penny?

-No! Penny is like a sister to me.

-Okay this is weirder than I thought- He look at Howard and realized something- Where is Bernadette?

-Who is Bernadette?- Howard asked.

-Your wife.

-I don't know any Bernadette and I'm not married either.

-Wait, was not that the name of your friend who worked with you at Cheesecake Factory?- Raj asked looking at Penny.

-It's true, but after she got her PhD, she stopped talking to me.

-Don't tell me you're married? -asked Sheldon of the future looking at Raj.

-I'm not married- said Raj.

-Well, at least that has not changed.

-I'm engaged.

-I don't understand why here many things are different.

-What do you mean?- Amy asked.

-Unless ... there really are multiverses.

-What's that?- Penny looked at everyone in search of an answer.

-There is a theory that there are multiple versions of the universe and that in each of these versions, there is another Howard, another Rajesh ... -began to explain Leonard.

-That's impossible- said the youngest Sheldon.

-As impossible as time travel?- Said Howard, pointing to the other Sheldon.

-I can not believe that time travel and multiverses are real,- Rajesh said.

-Can you imagine everything we would gain if we proof it.- Howard stood up excitedly.

-We must start working immediately-Leonard also stood up.

-Wait, wait.- The boys looked at Penny. -I want to know what my life is like in the other universe.

- Are you sure you want to know?

-Yes- replied Amy and Penny.

-In my universe-He point to Leonard and Penny-they have been married for 10 years, they have a son and at this moment Penny is pregnant. Both have very successful careers and ...

-Did I become a professional dancer?

- In my universe you never wanted to be a dancer. You wanted to be an actress, you left it and in the end you managed to be a very recognized actress.

- What about me?

- You married Bernadette 13 years ago and you have 3 children. And after many years you obtained your doctorate.

- This Bernadette that you say is my wife in another universe, is she pretty?

-All say that she could get something better, so...

-Sounds like she is very pretty,- Howard said excitedly.

-And in my universe Raj get married 5 years ago.

-Why did it take me so long to get married?- Raj said crossing his arms.

- You were very bad to have lasting relationships.

- What about you? Surely you live alone with a lot of cats-said Howard funny

-Well ... -in that moment his cell phone started ringing and he took it out of his pocket- Hi honey!

-Honey?-Penny said and they all looked at Sheldon.

-Surely it's his sister Missy,- whispered Leonard.

-For your information, it's my wife-the Sheldon of the past spit out his drink.