10 Greatest "I'm Dead And I Know It" Moments From Stargate

10. Daniel Jackson - Meridian

Now, this may be a little misleading but bear with me. Daniel Jackson was dosed with a fatal amount of radiation in the second-last episode of the fifth season, Meridian. This was also the episode that introduced Jonas Quinn to the team. The entire storyline was conceived due to behind-the-scenes issues, however, a backdoor was left open for Michael Shanks to return.

However, in Meridian, there is little doubt that Daniel is about to meet his maker. Both Carters, Samantha and Jacob, attempt to heal him with a Gou'uld device, to no avail. Dr. Fraiser does what she can, but human science hasn't evolved to the point where this level of radiation poisoning can be reversed. It very much looks like the jig is up.

In steps Oma Desala, an Ancient that Daniel had previously encountered. She tells him that she can help him ascend, though for all intents and purposes this is like dying, as once ascended he can't return to his previous life (that rule was just ignored in the following season).

Jackson shares a final goodbye with O'Neill, explaining what's happening. The man is completely at peace, knowing that he's about to move on. It may be something of a different type of 'I know I'm Dead' moment, but it is no less striking.