Released in 1988, 10 years after Halloween, Halloween 4 takes place 10 years after the Haddonfield incident. Michael Myers escapes a transfer, and returns to Haddonfield to stalk babysitters and murder a long lost female family member on (blog post) Halloween night, but his old doctor movie reviews is here to stop (blog post) him! Yes, that is the plot of both movies.
Source: Halloween 4 Movie Review - Decker Shado