Ep 19. The Changeling

SG-1 travels to P8X-987, a planet with a device that can supposedly heal any illness or injury. Upon arrival, they discover that the planet's inhabitants, a race of shape-shifters, are guarding the device and are wary of strangers. While negotiating with them, a member of SG-1 is attacked and replaced by one of the shape-shifters. The rest of the team must figure out who has been replaced before the changeling can gain access to the healing device and potentially use it for their own nefarious purposes.

As they search for their missing teammate, SG-1 begins to realize that the changeling may have infiltrated more than just their team. With the shape-shifter able to perfectly mimic any individual they come into contact with, the team must be cautious and vigilant as they try to uncover their enemy's plan.

Meanwhile, the missing team member finds themselves trapped in a strange and unfamiliar place, struggling to determine who they can trust. In this new environment, they are forced to adapt quickly in order to survive and escape.

As the tension mounts and the stakes rise, SG-1 races against time to not only find their missing teammate but also prevent the changeling from wreaking havoc on the planet and beyond. With twists and turns at every corner, The Changeling is a thrilling and suspenseful episode that keeps audiences on the edge of their seats until the very end.