Crossword puzzle clue "rumored reason for the stock market plunge of 5 6 10 whose effect is seen in this puzzle's theme answers"

Rumored reason for the stock market plunge of 5/6/10, whose effect is seen in this puzzle's theme answers

New element whose name will be ratified in January, 2010, and whose symbol appears in the middle of this puzzle's theme answers

Second letters of this puzzle's five theme answers (seen in order)

1987 market crash, and this puzzle's title, whose first word can precede each word in the starred answers

Number of times this puzzle's theme word appears diagonally in the grid (to complete the puzzle, shade those words plus the Down answers that begin where they meet)

Comic that comes to an end on October 3rd, and whose catchphrase ends this puzzle's theme answers

Doolittle, whose speech patterns can be heard in this puzzle's theme answers

Pulitzer Prize-winner Douglas whose three famous subjects are hidden in this puzzle's theme answers