The general rule when considering whether to underline or italicize movies and television series titles is to put them in italics because they're considered long works. ... The Associated Press (AP) recommends capitalizing movie titles and putting them in quotation marks.

Are movie titles underlined or in quotes?

Italics are used for large works, names of vehicles, and movie and television show titles. Quotation marks are reserved for sections of works, like the titles of chapters, magazine articles, poems, and short stories.

Which titles should be underlined?

Use underlining or italics, but not both. REMINDER The titles of creative works such as books, movies, works of art, songs, articles, and poems are capitalized. NOTE The titles of poems, songs, short stories, essays, and articles are not underlined or italicized. These titles are set off in quotation marks.