What actors and actresses appeared in The MacArthur Story - 1952?

The film you are referring to is likely "The Story of Gilbert and Sullivan" released in 1953, not "The MacArthur Story - 1952". There was no film titled "The MacArthur Story" released in 1952.

The Story of Gilbert and Sullivan starred:

* Robert Morley as Sir William Schwenck Gilbert

* Robert S. H. "Bobby" Howes as Arthur Sullivan

* Maurice Evans as The Duke of Buckingham (in "Patience")

* Marty Wilde as The Earl of Mountararat (in "Patience")

* Una O'Connor as Lady Jane (in "Patience")

* Rosemary Harris as The Duchess of Dunstable (in "Patience")

* Hermione Baddeley as Mrs. Grogan (in "H.M.S. Pinafore")

If you're thinking of a different movie about MacArthur, please provide more information.