* Brad Proctor Asgard Puppeteer
* Torri Higginson Dr. Elizabeth Weir
* Kira Clavell Amateratsu
* Kevan Ohtsji Oshu - First Prime to Yu
* Paul Hoosen Asgard Puppeteer
* Adam Behr Asgard Puppeteer
* Todd Masters Asgard Puppeteer
While Sam and Teal'c go to the planet of the former human-form Replicators to contact the Asgard to cure Jack, Daniel and Dr. Weir must deal with Goa'uld System Lords who want the Ancients weapon the Tau'ri used to destroy Anubis.
**# In this episode, Thor refers to the new Asgard home planet, Orilla, as being "rich in neutronium" on which both Asgard and humaniform replicator technology is based. As the term is commonly used, neutronium consists entirely of neutrons, and, if it exists, weighs somewhere around a half-billion tons per tablespoon. If neutronium existed on a planet, nothing would prevent it from sinking to the core of the world. Neutron stars, or pulsars, are believed to be solid neutrons and the densest bodies in the universe short of black holes. Since neutrons can be produced by known nuclear processes, it is far more likely that neutronium is something that would be manufactured rather than found.
# When Jack was frozen in the Ancient outpost, his jacket's collar was folded down, but when he was transported to Thor's ship, his collar was folded up
# Richard Dean Anderson (Jack O'Neill) does not appear in this episode.
# At some point in this season, they change Walter Davis's name to Walter Harriman because there is an actual USAF officer with the name Walter Davis. This was actually changed in Season 6, but the patch of his uniform was not fixed. You can tell by looking at his nametag, it changes from having two words (Walter Davis) on the top line to having one long word (Harriman) on the top line.
# Kira Clavell (Amateratsu) auditioned for the role of Teyla Emmagen in Stargate: Atlantis.
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