The Asgard contact Stargate Command and report that their leader, Thor, was killed during an encounter with the Goa'uld. Worse, the Goa'uld have upgraded their shields and weapons, and the Asgard can no longer count on winning conflicts against them.

An Asgard named Heimdall is conducting crucial experiments at an Asgard research station, but Goa'uld system lord Anubis has blockaded the planet. SG-1 is asked to rescue Heimdall and his research.

SG-1 is sent in the Goa'uld cargo ship they recovered. They use its cloaking device to bypass the Goa'uld blockade. Upon arriving, however, they learn that Thor is, in fact, alive and being held prisoner, and Heimdall insists that they rescue Thor, as well his own research.

Now SG-1 must penetrate the Goa'uld's new, stronger shields and board the ships above. Then they must find and rescue Thor and escape with him, Heimdall and the research — all while Anubis is searching for their exact location.

In the process of executing this daring scheme, the team learns some startling information about their own allies.

ANNA-LOUISE PLOWMAN	......	Osiris / Sarah Gardner
TERYL ROTHERY	......	Heimdall (Voice)
MICHAEL SHANKS	......	Thor (Voice)
Written by	......	Joseph Mallozzi & Paul Mullie
Director	......	Martin Wood