10 Crazy Characters You Forgot Existed In Stargate

10. Jonathan 'Jack' O'Neill

Jonathan O'Neil is the young clone of Jack O'Neill, created by the Asgard Loki. Though he was merely an experiment that was not due to be long term, but he was discovered by the SGC. That said, discovered is a bit of a misnomer - he walked right up to the front door of Cheyenne Mountain, claiming to be the original.

After Loki's actions were discovered, there left the question of what to do with the clone. 'Retiring' him clearly wasn't an option, and, thanks to Thor's help, he was saved. The sequencing that Loki used to create him had been breaking down, but this was halted and Jonathan O'Neill, as a teenager with thirty years of military experience, returns to high school.

And what could possibly go wrong with that?