Finally, contributing to a plot point not fully explored in Batman: Year Three, Dick Grayson was legally adopted by Wayne.
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In this version, Batman never caught or confronted the killer of his parents (thus rendering Batman: Year Two non-canonical), and more importantly, Batman was thought of as being an urban legend.
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This story started as the CBC TV movie Flight into Danger, then became the 1957 Paramount Pictures movie Zero Hour!, and was finally published as the novel Runway Zero-Eight (ISBN 0-440-17546-1).
In 1957, it was adapted into the feature film Zero Hour! and, more famously, parodied in the 1980 comedy, Airplane!.
Due to the success of The Long Halloween, the events of the story have generally been accepted into continuity as the "official" story of Batman's early years, given that Zero Hour retconned the events of Batman: Year Two and rendered them non-canonical.
This version of Micro Lad was originally part of the pre-Zero Hour DC Universe but is now known also to be part of the main continuity/main Earth in the current DC Multiverse.
Terror in the Sky is a low budget 1971 television movie remake of 1957's Zero Hour!, which itself was based on the 1956 television play Flight into Danger.
The timestream was mainly used by Waverider during Armageddon 2001, Death of Superman, and Zero Hour events.