- Alien vs. Predator
An American Tail: The Treasure of Manhattan Island
Amityville II: The Possession
Apocalypse III: Tribulation
Butch and Sundance: The Early Days
Carlito's Way: Rise to Power
Dominion: Prequel to the Exorcist
Dumb and Dumberer: When Harry Met Lloyd
Exorcist: The Beginning
Hannibal Rising
Hellraiser: Bloodline
Kermit's Swamp Years
The Lion King 1½
The Little Mermaid: Ariel's Beginning
Psycho IV: The Beginning
Retro Puppet Master
Ring 0: Birthday
The Scorpion King 2: Rise of a Warrior
Star Wars Episode I: The Phantom Menace
Star Wars Episode II: Attack of the Clones
Star Wars Episode III: Revenge of the Sith
Terminator Salvation
The Texas Chainsaw Massacre: The Beginning
Tremors 4: The Legend Begins
Underworld: Rise of the Lycans
X-Men Origins: Wolverine
Zulu Dawn
Went throught the list of film prequals at Wikipedia. Of the one's I've seen (above), the only ones I thought were any good were the origin story of Kermit the Frog, and Zulu Dawn, which like Temple of Doom, is hardly a prequal. The rest, IMHO of course, vary between 'meh' to 'dear god why!?'