Ben 10: Secret of the Omnitrix" has four different versions, each with slight variations in the story and the aliens Ben transforms into during the final battle. Here's a breakdown of the differences:

1. Original Version:
Alien in Final Battle: Heatblast
Plot: This version follows the standard storyline where Ben transforms into Heatblast during the final battle. It's the version that was aired most frequently on TV.
2. Heatblast Version:
Alien in Final Battle: Heatblast
Plot: Essentially the same as the original version, with Heatblast being the primary alien used in the final battle against Vilgax. This version solidifies Heatblast's importance in the Ben 10 series.
3. Diamondhead Version:
Alien in Final Battle: Diamondhead
Plot: In this version, Ben transforms into Diamondhead for the final battle instead of Heatblast. This offers a different perspective on how Ben defeats the antagonist using Diamondhead's unique abilities.
4. Eye Guy Version:
Alien in Final Battle: Eye Guy
Plot: This alternate version has Ben transforming into Eye Guy during the final battle. Eye Guy's abilities provide a unique approach to the battle, offering a fresh take on the climax of the movie.
Key Differences:
Alien Transformations: The primary difference between the versions is which alien Ben transforms into during the final battle.
Air Dates: Different versions were aired at different times, often as special events to keep the storyline fresh for viewers.
Story Adjustments: Minor adjustments in the storyline and dialogue are made to fit the abilities and characteristics of the alien featured in that version.
The variations were designed to keep the show exciting and engaging for fans by offering multiple outcomes and showcasing different aliens' abilities in the climactic battle.