When it comes to classic sci-fi TV franchises, the two that normally dominate conversations are "Star Trek" and "Doctor Who." Of those two, it's "Star Trek" that has had the greatest worldwide impact, with its characters and iconography having entered the common parlance. But a third sci-fi television franchise that rarely gets the recognition it deserves, "Stargate SG-1," is now streaming for free on Pluto TV.

Despite its greater focus on the military aspects of interstellar conflict, fans of "Star Trek" will find a lot to love about "Stargate SG-1." A spin-off of the 1994 film "Stargate," the series centers on a team of military specialists who explore alien worlds through a series of portals discovered on Earth. While the movie was mostly an action spectacle, the TV spin-off explores t

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