First of all read this if you just want the theory without any new episode information:
Now, I will plainly state the way this show handles time travel:
Everything that happens in the past is unchangeable. If you go into the past, not only are you not able to change it, whatever you do already happened and is remembered by all directly connected to it as already happening.
Now, lets give some in show proof.
The "Future Hiro" incident.
Future Hiro in no way was trying to change the past, he was simply completing his role in it. In the episode Future Hiro says that "Peter told him many times of this meeting" meaning the meaning already happened to the Peter in Future Hiro's past...meaning him going back is simply finishing the loop.
It may seem complicated but look at the conversation like so:
Peter: Future Hiro, this is all well and good, but how do you know all this!?
Future Hiro: Because you told me.
Peter: Well how in the hell did I know!?
Future Hiro: Because I told you.(not saying this is how the ACTUAL conversation went, just giving an example of the theory in conversational form, relating to this event)
It's just a giant loop of destiny. Yes, destiny, which is a major factor in this show. Many of the characters, both good and bad talk of destiny as a real thing. And in many comics and fantasy / science fiction shows destiny can appear almost sentient.
Next lets take a look at the Hiro / Charlie time traveling incident.
Lets map out everything that happened, with my assumptions (using proof from the show) to justify this theory.
Hiro and Ando walk into the diner, gleefully being Japanese and sitting down to another one of their wonderful chats about american food...no doubt leading to another squeal of Asian joy from our oriental hero, Hiro.
The waitress comes to take their order, having already (for the audience) shown some fairly keen Jeopardy skills. Her and Hiro get to talking, sharing chemistry, and Americanized Japanese banter. That is where we get a quick hint that there is something strange with this girl. Where does she know Japanese from? Well Hiro and Ando, being men of the people, ask what we at home are wondering. How do you know Japanese silly waitress woman!? Well apparently a yet unnamed friend gave her a book of Japanese phrases for her birthday that she apparently hasn't gotten around to studying fully until fairly recently. Now that all is explained we sit there noticing a rather bored and somewhat silently sarcastic (hows that for an alliteration, I'm chock full of them) Ando, watching as young love blossoms.
COMMERCIAL BREAK
We eventually come back to see Hiro and Charlie sitting far away from third wheel Ando (which is his AIM sn now). We see Hiro teaching the cute, cuddly, yet (as we know now) cursed Charlie how to speak Japanese. But all is not as it seems. She appears to know many words that arn't in the book. We know this is important because the writers went as far as to make our humble, habitually heteroclite hero, Hiro say "That's not in the book", which is a very important clue they intended for us to pick up on. Then, not soon after the first clue is tossed into our faces do we get another in the form of Charlie saying that Hiro's cheeks wobbling when he concentrates is cute. Now, granted, we didn't get a chance to see their entire conversation, but when has he ever had his cheeks wobble to "concentrate" other than when he is concentrating to use his powers? Never, and that's the point, before Hiro could think that through she walks away to be killed by the spooky, unshaven, (and from the looks of it) smelly Sylar.
Now this was not kosher for our peerless, power-enhanced protagonist. He was not going to let this slide. He would go back to fix this, to a day before, and keep her from going to work. He would make sure that this crush could develop into something more...maybe even allow him to get to second base! He tells Ando to count to five and that he'll be right back. Ando counts to five...no such luck.
What happened!?
Hiro doesn't go back a hour, or a day...or even a week. Our poor precocious protagonist goes back to six months ago...rather titular, eh? He is somewhat dumbfounded, and with just cause. We learn that maybe Hiro doesn't have quite as good a grip on his powers as we may have assumed. He tells her that he's from the future and that he is here to save her, and she is far from convinced. They take the dreaded photo that I will come back to later and live their lives for a little under six months. In that six month time period we learn some rather interesting things. Hiro teachers her Japanese while he appears to be getting a better grip on his own command of the English language. He works in the diner and gets to know everyone on a casual work related level. Another thing we learn here that is important is the fact that he was the friend who gave her the Japanese phrase book, furthering the idea that she in fact, remembered him from before and was already affected by his actions from traveling into the past (see loop theory above). So then we get down to the true romanticism. Hiro is continuing on his "you'll die soon lets get the hell out of here" rant and Charlie drops a bomb on him. Yes, she will die soon...but it matters not who does it...because she has an aneurism in her brain that will cause her to die. She has been enjoying their time together even though she normally doesn't let people get close because knowing she'd lose them when she dies would just make death that much harder, but Hiro changed all that and made her last days all the better. Just as they are declaring their undying love for each other Hiro gets sent out of time and back to some very aerobic Japanese business men who are somewhat confused as to why he's there...he's supposed to be on a sexy American vacation with his tall friend Ando...right?
So what happened here? Well the powers that be, the rift makers, manifested destiny...call it what you will...decided to kick him out. Nothing can be changed, even if you go in the past and try and change things, these are things that already happened in your timeline, and you may have even had a hand in causing them.
Everything is circular and predetermined. Nothing can be changed by going into the past, you are only following your destiny and doing what needed to be done in the first place for everything in the timeline to flow accordingly.
So with all this information three questions arise:
Whats with the picture change?
To answer that, it was a rhetorical cinematic device. For more information on that lets look at what the phrase "rhetorical device" means:
rhetorical devicen : a use of language that creates a literary effect (but often without regard for literal significance)(in this case being used in regards to cinema not to a written work...even though this part was written in by the writers...but you get where I am coming from here)
Used many times it artsy French films it shows symbolism to get across a feeling or a mood, in this sense it's meant to show the passage of time (in this case backwards) and to give us a great cutaway to keep us on edge until next week.
And it worked...look how many days have gone by and it still blows our minds.
Why did Hiro get sent back at that one perticular moment?
Come on, I mean we all want the little guy to get with Charlie...they would make adorable naive babies together. But lets face facts, there are greater things at work here. Destiny intervened and its as simple as that. He was getting to the point where his influence was no longer needed, so he was sent back...and at least he had a little under six months to be with the girl he loved...who apparently loved him back.
And the big one, why did Charlie pretend to not remember Hiro?
My vote goes to the fact that she was eventually convinced that yes, he did come from the future and i'm sure he told her the day it would happen. She went to work that day just to see him knowing it may kill her. She enjoyed the little time they spent together that day pretending she didn't know him, but still accidentally giving away clues (previously stated) until she walked into the backroom to have her head tragically mowed off.
I mean why waste the time that she was told may be her last day on Earth trying to explain to Hiro that he came back to tell her not to come that day. If she proceeds as usual then he would know anyway.
See, Charlie figured it out... but then again she is super smart.
Anywho if you disagree please give me the reasons why, and if I have an answer i'll sure give it. I am stuck working at this call center and this is one of the few forums I can post on...so I tend to leave it up all day and post inbetween calls.
I hope this wasn't too boring I tried to flair it up a bit for everyone so do me a favor and lets discuss this!
- Billy.