Zero Hour: Crisis in Time Mini Issue 3

• Final appearance and death of the original Atom (Albert "Al" Pratt).

• First appearance (cameo) of Alpha Centurion (Marcus Aelius).

• "Zero Hour (Part II)" –
... 17 Hours, 7 Minutes Ago: The Justice Society decides to take the fight immediately to its source, using their extensive experience with time-related problems as an advantage.
... 17 Hours, 3 Minutes Ago: While traveling to New York City with Metron, Superman goes to investigate screams coming from Keystone City, and meets up with Impulse, who is fighting Dinosaurs. He enlists the young speedster to join him.
... 16 Hours, 22 Minutes Ago: Outside of the Timestream, the Time Trapper reveals to Rokk Krinn that he is in fact just an older version of himself.
... 14 Hours, 39 Minutes Ago: In New York City, the heroes of the world finally converge and join together.
... 17 Hours, 3 Minutes Ago: The Justice Society arrives at Vanishing Point, and Extant immediately begins blasting them with Chronal Energy.
... 14 Hours, 1 Minute Ago: On Cairn, Vril Dox of L.E.G.I.O.N. determines that the Timestream is falling apart and sends probes into it to investigate.
... 14 Hours Ago: In Supertown, even the New Gods themselves are terrified of the entropy, as Highfather finds himself unable to feel to feel the powers of the cosmos anymore.
... 13 Hours, 59 Minutes Ago: The heroes discuss the chronal disruptions with Waverider, and whether or not they can determine who's real and who isn't.
... 12 Hours, 50 Minutes Ago: The Justice Society continues to fight Extant, but are grossly outmatched.
... 12 Hours, 45 Minuts Ago: From New York, Waverider feels for the presence of Extant.
... 12 Hours, 42 Minutes Ago: A city from the 25th Century (home of Booster Gold) appears above New York City, and begins slowly descending.
... 12 Hours, 38 Minutes Ago: Extant causes Alan Scott's power ring to suddenly lose all its power.

NOTE: This is the first appearance of the Alpha Centurion. He will make his first full appearance, however, in Adventures of Superman #516 where his origins are explained. Although his timeline is erased after Zero Hour ends, a version of him will eventually show up in mainstream continuity.

NOTE: Mini-series was published weekly, starting with issue #4 and counting down to issue #0.