The 3rd edition update to the classic Gygax intro adventure.
Return to the The Temple of Elemental Evil has a new generation of characters returning to the Village of Hommlet (where time seems to have stood still) to investigate the new uprising of evil.
Designed obviously to appear to adults who were kids when the original T1 and ToEE came out, it looses none of it's appeal.
Regardless what version of the game you play, if you ever played the original ToEE then pick this up.
If you have never played or run the original, but are a fan of the 3rd game, then certainly pick this up.
This is one of those adventures that should be republished for every edition of D&D. Great to start with and run some 1st level characters through but dangerous enough to merit coming back to at a later time.
Besides who doesn't want to go up against ultimate evil, stare in into it's ugly face and say "come get some!"