(full screen version only)
In 2007, when Cartoon Network release a new season of the popular cartoon show Foster's Home For Imaginary Friends, the intro was redone. The full version of the second intro was only shown once. When the second episode of the new season aired, the intro was shortened so the network could fit more commercials into the timeslot. In 2011 or 2012, a YouTube user uploaded the second intro, but the user removed it in 2013. The intro had updated versions of the characters, but the intro still has the same plot as the first intro. What's missing from the intro now are Mac walking up to Wilt, Eduardo, Coco, and shots of Frankie, Madam Foster, and Mr. Herriman. It wasn't until 2016 that the intro was reuploaded and presented in it's original widescreen ratio because at the time of season 5, Foster's was made in high definition.
https://www.youtube.com/watch?v=W9Ju4tILmNg (TAKEN DOWN FOR COPYRIGHT)
UPDATE: Despite this being unseen on Cartoon Network and Boomerang, and removed from video sharing websites by copyright conflicts, the full version of the second intro remain intact on the first few episodes of season 5 on Hulu, except it is in 4:3 aspect ratio (full screen). The widescreen versions of the intro and rest of the series have yet to see the light of day.