P4X-884
From The Stargate Omnipedia
Falsely believed to be a hot and sunny beach, P4X-884 is in fact a technologically advanced base of operations for Togar, a scientist who lures subjects to his planet in order to tag them with Urgo device for study.
DETAILS
HOME TO - Togar
FIRST APPEARED - Urgo
KEY EPISODE
Urgo - Believing they were traveling to a beautiful world, SG-1 goes to P4X-884 and returns with Urgo in their heads.