INDIANA JONES-THE COMPLETE ADVENTURE COLLECTION is a four DVD set collection of the four Indiana Jones films. For those who don't know, the four Indiana Jones movies are:
RAIDERS OF THE LOST ARK (that's the original title; I resist Lucas revisionism as much as possible)
INDIANA JONES AND THE TEMPLE OF DOOM
INDIANA JONES AND THE LAST CRUSADE
INDIANA JONES AND THE KINGDOM OF THE CRYSTAL SKULL
The first three films were released in the spring of 2008 as special edition discs. The only thing new here is the inclusion of INDIANA JONES AND THE KINGDOM OF THE CRYSTAL SKULL. Other than that movie and the extras that are included with it, there is nothing else new here.
Therefore, if you already have purchased the first three movies, just buy a copy of INDIANA JONES AND THE CRYSTAL SKULL (it has the same extras that are included on this disc) and save yourself thirty or forty dollars. If you don't own those movies, I'd still advise you buy them separately. Prices have dropped since the special edition DVDs were released in the spring and you can buy all four of the individual movies for a total of about $5-$10 less for what it costs for this boxed set.