Armed with a spectacular cast for “Disclosure Day” (★★★½ out of four; rated PG-13; in theaters June 12), Spielberg takes an imaginative look at what it would look like if humanity actually found out i...

But his highly anticipated return to the sci-fi summer blockbuster, the brilliant and beguiling “Disclosure Day,” is Spielberg’s most shameless appeal toward idealism yet.

The film starts in medias res, as Dr. Daniel Kellner (Josh O'Connor) is being pursued by Noah Scanlon (Colin Firth) and a team of henchmen for stealing intellectual property from Wardex, a government ...