"Stargate SG-1" is a science fiction television series that originally aired from 1997 to 2007. It was a spin-off of the 1994 movie "Stargate" and continued the story with the same concept and characters. The show revolves around a group of explorers and military personnel who use an ancient alien artifact called the Stargate to travel to other planets and explore new worlds.
The main characters in the series include Colonel Jack O'Neill, played by Richard Dean Anderson, Dr. Daniel Jackson, played by Michael Shanks, Captain Samantha Carter, played by Amanda Tapping, and Teal'c, played by Christopher Judge. Together, they form the SG-1 team, tasked with exploring new worlds and fighting off various threats, including extraterrestrial species and the Goa'uld, a race of parasitic aliens who pose a significant threat to Earth.
Throughout the series, the team encounters various allies and enemies, including other advanced civilizations, rogue nations, and ancient artifacts that have the power to change the course of human history. "Stargate SG-1" was known for its intricate storylines, engaging characters, and special effects, which helped make it a popular and long-running sci-fi series. It also spawned several spin-offs, including "Stargate Atlantis" and "Stargate Universe."