Lyon is a nine year old boy who comes across the Oppositrix, which was made by Highbreed. The Oppositrix has opposites of all aliens. You can see the opposite aliens in the Oppositrix article. The Oppostrix has a blue hourglass on it.
Lyon 9: Seventeenth Opposite
This is where Lyon becomes 17 and gets new aliens.
Ultimatehero's Series'
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|---|---|
| First SeriesLyon 9: Opposite Alien - Lyon 9: The Crossover Days - Former Untold | |
| Middle SeriesBen 10: The Final Fight - Finn 10: Fusion - Lyon 9: Seventeenth Opposite | |
| Final SeriesBen 10 Franklin - Neb 10 | |