Halloween II is a 1981 American slasher film directed by Rick Rosenthal in his directorial debut, written and produced by John Carpenter and Debra Hill, and starring Jamie Lee Curtis and Donald Pleasence who reprise their respective roles as Laurie Strode and Dr. Sam Loomis.

It is the second installment in the Halloween film series and a direct sequel to Halloween (1978). The plot picks up directly after the first film, with Michael Myers following survivor Laurie Strode to the local hospital, while his psychiatrist Dr. Loomis continues his pursuit of him.

Though Carpenter and Hill co-wrote the screenplay to the sequel, Carpenter was reluctant to extend his involvement and refused to direct, instead appointing the direction to Rosenthal.

Stylistically, Halloween II reproduces certain key elements that made the original Halloween a success, such as first-person camera perspectives, and the film picks up right at the end of the cliffhanger ending of the original film and was intended to finish the story of Michael Myers and Laurie Strode.

It also introduces the plot twist of Laurie Strode being the sister of Michael Myers, a feature that would inform the narrative arc of the series in subsequent films.

Filming took place in the spring of 1981, primarily at Morningside Hospital in Los Angeles, California, on a budget of $2.5 million.
...
https://www.youtube.com/watch?v=z5n5TaEzYi8