When he grew up, Sam found that he could let his consciousness pass through to his past self, and met Gao Boer (the old bearded man, who should be his teacher) during that time. Sam disobeyed Gobol's advice and traveled to the night of the fire to save his sister.
Back to reality (the reality here refers to the time before Sam traveled) and found that although his sister was saved, his parents were burned to death. After that, he obeyed Gao Boer's advice and stopped trying to cross back to save his parents. Sam relied on the clues to investigate the murder and depended on his sister for life. During this period, Sam's girlfriend Rebecca was killed and the murderer was identified as Lennon.
One day Rebecca's sister Elizabeth asked Sam to tell Sam that the murderer of her sister was not Lennon, and told him that Rebecca had fallen in love with Lennon instead of Sam at the time. Elizabeth asks Sam to rescue Lennon and find out the real culprit. Sam talks to Goblet in the bar, and then goes to bed with the bar girl (here sister Jenny finds out that Sam has sex with the bar girl in a later journey). Regardless of the advice of Goble and his sister Jenny, Sam insists on traveling back to the night Rebecca was killed to find the real culprit.
It turned out that sister Jenny followed Sam through and not only killed Rebecca but also killed Elizabeth by the way.
Lennon was evacuated because he found out that Sam left, and Sam became the biggest suspect. Jenny did a perjury of Sam's absence to avoid Sam's jail. Sam was puzzled by the current results, and learned at the police station that a Pontiac killer had appeared and killed many women. After communicating with Gao Boer, he decided to investigate the real culprit from the third woman. Sam crossed and hid in the house of the third victim, but was discovered on the spot by mistake, and was later prosecuted and sentenced to a restraining order (A). After returning to reality, it was found that the third victim did not die (because Sam was found on the spot and sentenced to a restraining order, he would not have feelings with Sam, so he was not killed by Jenny). Sam was very puzzled and went to find Gobol, found that Gobol has disappeared (abducted by Jenny).
Sam drinks at the bar, talks to the barmaid, and goes home after getting drunk. Jenny then killed the barmaid. Because Sam was the last customer, he was detained by the police as a suspect. Sam was released on bail by his sister after stealing some information about the murder from the police station.
Sam found the corpse of the abandoned car yard on the information he stole from the police station. After crossing, he was arrested by the police again when he tried to catch the real culprit. The evidence at this time was very unfavorable to Sam. After asking the black police officer to tell him what he and his wife were talking about for the first time, he obtained the leader and temporarily left the prison.
Sam returned to his sister's house and found the flowers that Gobol used to keep people in a coma. At this time, Sam suspects that Gobol is the real murderer, and once again crosses back to the abandoned car factory, he accidentally finds Gobol who is injured and imprisoned. When he went out to find help, Sam was pinched by a trap, and then found out that his sister Jenny was actually a Pontiac killer. Jenny confesses her murderous journey to Sam and tells Sam that she loves him so much.
Distraught, Sam traveled to the moment of the fire and cruelly locked his sister Jenny in the room and burned to death. After returning to reality, Sam meets his parents, wife Elizabeth, and daughter Jenny.
Sam's daughter Jenny burned her doll toy on the grill.
The above is the basic plot, talk about your own views.
1. Is there a parallel world?
There is no such thing as a parallel world. This movie is not a physics science fiction. Sam will affect himself while changing the past. If it is a parallel world, a parallel world was created at the moment Sam went back to the past to make changes, then which world did Sam return to the "now"?
So don't watch the butterfly effect with the idea of parallel worlds, otherwise you will be trapped in logic errors and unable to extricate yourself. The rule is that there is only one world, and changes Sam made in the past of this world will affect the present of this world. The chain reaction includes the changes in life experienced by himself, his relatives, and friends. The only difference is that Sam can retain different memories of life caused by different reactions in the past.
2. The problem with Sam's daughter Jenny
There is no doubt that Sam named his daughter Jenny because of his sister Jenny who was killed by him in a few years. But at the end of the movie, Little Jenny burned the doll and the weird smile on her face sparked a lot of speculation. This is just to pave the way for the sequel! It is obvious that Jenny also inherited her father's special abilities. At this time, Jenny should be the grown-up Jenny who passed through her body, and burned the doll for reasons we don’t know yet. It has absolutely nothing to do with Sam and Sam's sister Jenny.
3. The bifurcation of time
Sam was 15 years old when his sister was burnt to death in a fire at home (A). At this time, Sam didn't know the real cause of his sister's death. When he grew up, Sam found that he could travel through -> Meet Gao Bo Go back and save my sister (B) -> Live with my sister, follow Goboer's suggestion to cross but only as an observer -> fall in love with Rebecca (C) -> Rebecca is killed -> Crossing -> Elizabeth was killed, there appeared Pontiac assassin, the disappearance of Goboll, the girl was killed, etc. -> Crossing -> I really wanted to (D)-Crossing to A and burned my sister to death. As a result, the parents did not die, and Gobol, Rebecca, and Elizabeth would meet Sam one by one. Sam and Rebecca’s love relationship was intervened by a third person, Lennon, and Sam finally married Elizabeth and named her daughter Jenny to commemorate the younger sister in his memory.
From A to D above is just a fork in Sam's life, Sam still gets back on track after making choices again and again, but the memory of this fork is always in Sam's heart.
The above is my understanding. If you bring in the concept of parallel worlds, you will find that it is really difficult to understand this film logically and thoroughly.
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