| 0 | Zero Hour and Other Stories | cover | 1 | pencils: Jack Kamen; inks: Jack Kamen | |
| 1 | Zero Hour and Other Stories | credits, title page | 3 | pencils: Jack Kamen; inks: Jack Kamen | |
| 2 | - | table of contents | 2 | pencils: Jack Kamen; inks: Jack Kamen | |
| 3 | Graceful, Glamorous, and Easy on the Eye | text article | 8 | script: Bill Mason; pencils: Jack Kamen; inks: Jack Kamen | |
| 4 | Only Human! | comic story | 7 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Andrew Harmon; unnamed M.P.; unnamed Secretary of Defense; Miss Landers; Buster (an electronic brain) |
| 5 | Shrinking from Abuse! | comic story | 7 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Doctor Hugo Masterson (death); Martha Masterson (Hugo's wife); Professor Hardin |
| 6 | The Last Man! | comic story | 7 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Larry; Hank; Larry's sister |
| 7 | A Lesson in Anatomy!! | comic story | 7 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Stevey Williams; Dr. Williams (county coroner, Stevey's father); Martha Williams (the doctor's wife); Sheriff Ames; a stranger (villain, a robot, death); two alien beings (villains) |
| 8 | Saving for the Future | comic story | 7 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Dr. Lloyd Brewster; Grace Brewster (Lloyd's wife, mention only); Ellen (Brewster's assistant and lover); Joe (a banker) |
| 9 | The Trip! | comic story | 7 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Lon Masterson (scientist); Edith Fuller (Masterson's assistant); Henrietta Masterson (Lon's wife); Colonel Curtis |
| 10 | Close Call! | comic story | 6 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Dr. Annette Beard; Dr. Granger (flashback); Roger Forbes (engineer, flashback) |
| 11 | Miscalculation! | comic story | 6 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Melvin Sputterly; Miss Winkleman (Melvin's neighbor); Mr. Hamish (building superintendent) |
| 12 | He Who Waits! | comic story | 6 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Percy (bachelor scientist); Alec; Petite (a flower girl, death) |
| 13 | Given the Heir! | comic story | 6 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Seymour Watkins; Helen Watkins (Seymour's wife); Zenob Watkins (the Watkin's great-great grandson from the future) |
| 14 | What He Saw! | comic story | 6 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Martin; two beautiful girls (apparitions); Jean (Martin's wife, apparition); Czuk (villain); Trark (villain) |
| 15 | Off Day! | comic story | 6 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Professor Stanley Dingle; Robbie (baseball player); Pee-Wee (baseball player); unnamed janitor |
| 16 | The Parallel! | comic story | 6 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Calvin Henkel (death); Florence Henkel (Calvin's wife, death); Mrs. Fishkin (Calvin's neighbor) |
| 17 | Zero Hour | comic story | 7 | script: Ray Bradbury, Albert B. Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Mary Morris; Mink Morris (daughter of Mary Morris); Henry Morris (Mary's husband); Joseph Conners; Anna; Peggy Ann; Helen (Mary's friend in New York); Tim (Helen's son); Drill (villain, a Martian) |
| 18 | Hot-Rod! | comic story | 7 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Sally (Amos' lover); Cynthia (Amos' wife, death); unnamed time traveler; Amos (villain, a bookkeeper) |
| 19 | ...Conquers All! | comic story | 6 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | invasion ship crew members [unnamed Chief; unnamed doctor; Phebe; Cuno; Mara; Xano; others unnamed] (villains) |
| 20 | Surprise Package | comic story | 7 | script: Ray Bradbury, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Leonard Hill (mention only); robotic Leonard Hill (death); Martha (villain, death) |
| 21 | Punishment Without Crime | comic story | 7 | script: Ray Bradbury, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | George Hill; Katherine Hill [aka Katie] (George's wife); Leonard Phelps (Katherine's lover); Katherine (a marionette, death); Smith (a Policeman) |
| 22 | Planely Possible | comic story | 6 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Walter Thurmond (death); Ruth Thurmond (Walter's wife, death); Dean Warburton (a hospital lab technician) |
| 23 | The Freaks | comic story | 7 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | The Freaks [Bosco (the dog-faced boy, death); Mildred (the fat lady); Elasto (the rubber-skinned man); Aldo (the hairy ape-man); Tarpo (the living skeleton); rest unnamed]; Stanley Gilby (circus co-owner); Ned Smote (circus co-owner); Callon-X (man from the future) |
| 24 | 4th Degree | comic story | 6 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Val Draper (teacher, death); Andrea Coles (a scientist); Miss Tebbits (a nurse); Dr. Felix Walton (villain, S.S. Police member) |
| 25 | Round Trip | comic story | 5 | script: Bill Gaines, Al Feldstein; pencils: Jack Kamen; inks: Jack Kamen; letters: Jim Wroten | Henry Wilkens (diner dish washer); Ellie (Henry's wife) |
| 26 | - | illustration | 3 | pencils: Jack Kamen; inks: Jack Kamen | |
| 27 | Jack Kamen | text article | 5 | script: S. C. Ringgenberg; pencils: Jack Kamen; inks: Jack Kamen | |
| 28 | From Science Fiction to Science Fortune | text article | 1 | script: S. C. Ringgenberg; pencils: Jack Kamen; inks: Jack Kamen | |
| 29 | Behind the Panels | text article | 1 | script: Tom Spurgeon, Janice Lee, Arthur Lortie | |
| 30 | - | illustration | 2 | pencils: Jack Kamen; inks: Jack Kamen | |
| 31 | Cool Tech and Hot Passion! | promo (ad from the publisher) | 1 | pencils: Jack Kamen; inks: Jack Kamen | |