Pretty much everyone has it as one episodes. I can't change it unless you can find me proof that it aired as two episodes e.g. a 1978-10-09 newspaper TV listing.

Found this information. Hope it helps. Thank you. IMDb: Alternate versions "While broadcast as a one-hour program, syndicated versions are edited into two parts. The syndicated version however, has been the only version of the episode available since the original network broadcast, both in syndication and on the Season 7 DVD set. On the DVD set, a disclaimer is added that says that the original master was damaged and unusable for the DVD set." So this means that nobody will have the original 1 hour episode that was originally aired. All DVD releases have the split 2 episode version.

@bosqueaker said:

So this means that nobody will have the original 1 hour episode that was originally aired.

As indicated in our rules, all our listings are going as per the original broadcast. This confirm that it should be listed as a one-hour episode.