Hi Joey, in some markets, I think the final syndication package did include the end of Leviathan, but I'm not sure.
In the fandom community of the 1980s, fans circulated information about the complete series via zines and newsletters and towards the end of the decade, BBS forums. Some fans had kept notes (and tape recordings, as I'm sure you know) of every episode and topics such as Vicky's fate were routinely discussed and, for those who had forgotten or never saw the episodes, they had the opportunity to learn about it.
G.