South Park (Lost Mexican Spanish Dub)

In 1998, South Park began airing in Spanish on a local Mexican channel. The company that dubbed it was Audiomaster 3000, known for dubbing many foreign shows into Latin American Spanish. This dub covered season 1 and 2. Not many people liked it, mainly because of the fact that a lot of the profanity was censored and replaced with Mexican slang terms. The show later began airing on a channel called Locomotion, dubbed by 2 different studios while on that channel. It later moved to MTV until 2012, when Comedy Central launched in Latin America. Seasons 1 and 2 were later redubbed by BVI Communications, the new dubbing studio for South Park.

Why it's lost
This dub is likely lost because not many people liked it, and that means less people would've recorded it onto personal tapes, leading to it fading into obscurity. Another reason is because of the aforementioned BVI redub of the seasons Audiomaster covered, naturally making the older dub obsolete.

What has been found
Season 1 in its entirety has been lost. However, some small parts of Season 2 have been found, and is easier to find, as MTV aired it once, and one full episode has been unearthed.

(Full episode) S2E10: Chickenpox (Note: can only be found on the Televisa Season 2 DVD)

Theme song (season 2 version only, the season 1 original is missing)