This science fiction adventure TV series, which premiered in 1997, follows a secret military team that uses an ancient alien device to explore other planets and defend Earth from extraterrestrial threats, particularly the Goa'uld. What is the name of this show?

The science fiction adventure TV series described, which premiered in 1997 and follows a secret military team exploring other planets and defending Earth from extraterrestrial threats, particularly the Goa'uld, is indeed Stargate SG-1 (Review). The show is a spin-off of the 1994 film Stargate and debuted on Showtime on July 27, 1997. It ran for an impressive ten seasons, totaling 214 episodes, making it one of the longest-running North American science fiction series.

The series centers around the Stargate Command (SGC) program, where Colonel Jack O'Neill, Dr. Daniel Jackson, Captain Samantha Carter, and the Jaffa warrior Teal'c form the primary team, SG-1. They utilize an ancient alien device, the Stargate, to travel across the galaxy to distant planets. Their missions are diverse, ranging from forging alliances with friendly civilizations to discovering advanced technologies, all while facing constant threats.

A central antagonist throughout much of the series is the Goa'uld, a parasitic alien race that takes human hosts and poses as gods to enslave populations across the galaxy. The Goa'uld are depicted as ruthless, technologically advanced, and highly egomaniacal, having stolen much of their technology from other races. The series delves into the Goa'uld's feudal society, their origins as aquatic predators, and their use of the Jaffa as incubators for their young.

Stargate SG-1 built a rich and complex mythology, expanding on the concepts introduced in the original film and introducing new alien races and overarching storylines. Its blend of military action, scientific exploration, and mythological elements, combined with engaging characters and a consistent narrative, contributed to its lasting popularity and status as a beloved science fiction staple. The show's success also led to several spin-off series and direct-to-DVD movies.