Table:
0
A
B
C
D
E
F
G
H
1
No.
#
Title
Director
Writer
US air date
Storyteller
Villains
2
14
1
"The Tale of the Final Wish"
D. J. MacHale
Chloe Brown
June 19, 1993
Kristen
The Sandman
3
15
2
"The Tale of the Midnight Madness"
D. J. MacHale
Chloe Brown
June 26, 1993
Frank
Nosferatu and Dr. Vink
4
16
3
"The Tale of Locker 22"
David Winning
Chloe Brown
July 3, 1993
Kristen
None
5
17
4
"The Tale of the Thirteenth Floor"
Michael Keusch
Anne Appelton
July 10, 1993
Betty Ann
Leonid, Olga, and Raymond
6
19
6
"The Tale of the Dark Dragon"
D. J. MacHale
Allison Lea Bingeman
July 24, 1993
David (for Gary's birthday, borrowing Sardo)
The Dark Dragon Potion
7
20
8
"The Tale of the Whispering Walls"
D. J. MacHale
Allison Lea Bingeman
July 31, 1993
Betty Ann
Master Raymond
8
21
7
"The Tale of the Frozen Ghost"
Ron Oliver
Naomi Janzen
August 14, 1993
Kristen
None
9
22
9
"The Tale of the Full Moon"
Ron Oliver
Ron Oliver
August 21, 1993
Frank
Gordon, the Werewolf
10
23
10
"The Tale of the Shiny Red Bicycle"
David Winning
Cassandra Schafhausen
August 28, 1993
David
None
11
24
11
"The Tale of the Magician's Assistant"
Ron Oliver
Cassandra Schafhausen
September 11, 1993
Gary
Nazrak
12
25
12
"The Tale of the Hatching"
D. J. MacHale
Chloe Brown
September 25, 1993
David
Mr. and Mrs. Taylor

Questions and formulas:
Question: How many writers had an US air date of september 25, 1993?
Formula: ROWS(UNIQUE(FILTER(E1, F1="September 25, 1993")))
Formula2: ROWS(UNIQUE(FILTER(E2:E12, F2:F12="September 25, 1993")))
Level: medium
Question: How many villians were in No. 25?
Formula: ROWS(UNIQUE(FILTER(H1, A1=25)))
Formula2: ROWS(UNIQUE(FILTER(H2:H12, A2:A12=25)))
Level: medium