* "The Great Space Giveaway"
* "The Big Bug"
Reason for their absence:
These episodes were not included in the DVD set due to music licensing issues.
* "The Great Space Giveaway" features a song by the band "The Ramones" that was not licensed for use on the DVD.
* "The Big Bug" includes a song by the band "The Hooters" that also was not licensed.
The DVD producers were unable to secure the necessary rights to include these songs, so the episodes were left out of the set.
It's important to note: While these episodes are unavailable on the Season 4 DVD, they are available for streaming on various platforms, including Hulu and Amazon Prime.