For Croatian-specific subtitles, your best options include specialized subtitle community databases:
: A large repository where users frequently upload regional translations for classic TV shows. Kolchak: The Night Stalker titlovi Hrvatski S01E01
: One of the most popular regional sites for Balkan (Croatian, Serbian, Bosnian) subtitles. Search for "The Ripper" or "The Night Stalker" to see if a community translation exists. For Croatian-specific subtitles