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search  The Tok'ra are a fictional alien race on the science
fiction television series Stargate SG-1. They first appear in
the season 2 episode "In the Line of Duty". In the show, the
Tok'ra are biologically the same species as the Goa'uld who
inhabit human hosts in a symbiotic relationship, and are opposed
to the evil System Lords. They are one of the major offworld
allies of Stargate Command.   Biologically, the Tok'ra are the
same species as the Goa'uld, though they are opposed to them in
every way; their name "Tok'ra" literally means "against Ra,"
though it has gained the figurative meaning "resistance". The
Tok'ra consider it an insult to be called a Goa'uld. They take
only willing human hosts, providing long life and perfect
health, and share the body equally.[1] Most Tok'ra are spawned
from a single Queen, Egeria, who fought the Goa'uld 2,000 years
ago and was defeated by the Supreme System Lord Ra. A few other
minor Goa'uld have joined the Tok