FOR all horror movie fans around the world, there is one classic film that will always stand out.
The original Halloween film saw evil Michael Myers terrorise his family - and it all started with him killing his sister.
Why did Michael Myers kill his sister?
Michael's story starts on Halloween in 1968 when he is six-years-old and his sister Judith is babysitting him.
Rather than taking him trick or treating, or even looking after him, Judith chooses to have sex with her boyfriend.
After the boyfriend leaves, we see Michael, armed with a huge kitchen knife, go up to his sister's room and stab her to death.
His motive for murder could follow slasher movie logic - in which the killer is often motivated by a combination of neglect and jealousy.
Michael was supposed to be being looked after by his sister who was babysitting him - but instead she went off to have sex.
This leads to the theory that Judith choosing her boyfriend over him, saw Michael react by killing her.
When is the plot of the original Halloween movie?
The first film was released in theatres in 1978.
On a cold Halloween night in 1963, six year old Michael Myers brutally murdered his 17-year-old sister, Judith.
He was sentenced and locked away for 15 years.
But on October 30, 1978, while being transferred for a court date, a 21-year-old Michael Myers steals a car and escapes Smith's Grove.
He returns to his quiet hometown of Haddonfield, Illinois, where he looks for his next victims.
How many Halloween films are there?
There have been nine Halloween films.
Michael Myers is the antagonist in all of the films with the exception of Halloween III: Season of the Witch, a story with no direct connection to any other film in the series.
In 2007, writer-director Rob Zombie created a remake of the 1978 film.
A sequel to the 2007 film was released two years later.
A direct sequel to the original film, which ignores all previous sequels, was released in 2018.
Two sequels to the 2018 film, Halloween Kills and Halloween Ends, are scheduled for release in 2021 and 2022, respectively.