Episodes 1-19 were originally aired under the name "Odyssey USA".
End of Odyssey USA title
Start of Adventures in Odyssey title
At the end of the 1996 season, the AIO team took a nine-month break, with no new episodes until September 1997. According to the "Adventures in Odyssey HQ" website, "the hiatus" means the time from December 1996 to September 1997 where no episodes were produced. The writers, producers, actors, and production engineers needed a break from the daily pressure of the program and after ten years of production decided it was time. Many things have changed from "old Odyssey" before the hiatus to "new Odyssey" after the hiatus. None of the children (unless you count Rodney Rathbone) from old Odyssey have been carried over to new Odyssey. Nearly all of the storylines from old Odyssey were finished off in the final album of that era (Welcome Home) and the show has in general had a different "flavor" than before."
During this season, the series experimented with a "split-episode" format for some episodes. The concept was not particularly popular and the format was ultimately discontinued.
Enjoy
The AIO team was on a year-long break, with no new episodes until September 2009. This was similar to the First Hiatus back in 1996-1997.
Originally, the first few albums included every episode in chronological order exactly as it aired on the radio. The 3rd album release (#2) would have featured the episodes starting with "19: Recollections" and ending around "30: Honor Thy Parents", but it was canceled when the "Officer Harley" controversy occurred. The following album, "Grins, Grabbers, and Great Getaways" was then released, continuing where the unreleased album would have left off. After those releases, future albums no longer followed the exact chronological order, and episodes were often edited. "Family Portraits" was later phased out, and "Album 1" was re-released several times, first with simply a title change and the same tapes, and in 1992 with all references to "Officer Harley" and "Odyssey USA" removed.
New Packaging (1991): Following the release of the first Adventures in Odyssey video in 1991, all future albums featured the new character designs from the film series, and also a new naming convention. It also marked the end of the original theme music.
Albums 1 through 15 were originally released only on compact audio cassette; starting in 2003, Focus on the Family re-released those albums as part of the Gold Audio series. The Gold Audio series includes remastered CD versions of the original 15 albums, along with a few previously-unreleased episodes as a bonus. However these are not true re-releases. As mentioned in the Officer David Harley section, all the episodes in these albums that originally contained Officer Harley have been replaced with other episodes or edited versions of the original episodes, carrying over the changes first made in "The Early Classics" when it was released in 1992. The openings to many episodes have been removed or replaced, most evident in episodes such as "A Member of The Family" (1988) which now features a newly recorded opening with Whit voiced by Paul Herlinger rather than Hal Smith. Other differences include a different ordering of the episodes to make the chronological listening experience more accurate, and a removal of references to cassettes at the end of multi-part episodes. The changes are most noticeable in albums 0-3, while episodes from albums after 7 feature comparatively fewer changes. Also the albums have been renamed by suggestions from listeners as well other means. The newest album title, "The Lost Episodes" is not exactly true, considering every included episode has previously been available for purchase individually, just not always in a collection. They are now being replaced with regular albums (instead of "Gold Audio").