Historical clue formulations

• Title held by the people who lent their names to 17-, 24-, 38- and 49-Across — 2015-12-14
• See 17-, 24- and 36-Across — 2013-07-04
• See 19-Across — 2008-02-17
• Nicholson role in "Mars Attacks!" — 2003-03-27