The Grim Adventures of Billy and Mandy: Matinee Mandy (lost original English version of animated short; 2007)
In 2007, Cartoon Network released a short based off of The Grim Adventures of Billy & Mandy titled Matinee Mandy. It is unknown as to what specific date the short was released or if it even aired in america at all.
Two versions of the short are known to exist online, both uploaded to YouTube, but neither is in English. The first upload is in 4:3 and features both Chinese subtitles and Chinese voices. The second upload is in widescreen; it appears to be a recording from a Thai version of Boomerang and features Thai dubbing. It is unknown if the English version was ever released or if any copies of it still exist.
In May of 2017, YouTube user shooterboss uploaded the Chinese dub with fan-made English subtitles.