This is what I tried with success.
=INDEX(IMPORTHTML("https://en.wikipedia.org/wiki/List_of_highest-grossing_films","table",1),,3)
=INDEX(IMPORTHTML("https://en.wikipedia.org/wiki/List_of_highest-grossing_films","table",1),,3)
The ,3 imports column 3 only add other column numbers with 1,2,3,4 etc
,,3).