If you were actually looking for the Stargate Atlantis episode "Phantoms" (S3E9) , it is a psychological thriller where a Wraith device causes the team to suffer intense hallucinations based on their own deep-seated traumas. For example, John Sheppard relives a traumatic mission in Afghanistan, while Rodney McKay experiences a catastrophic technical failure. REVIEW: The Flash – Season 8, Episode 9 "Phantoms"
While there is no single episode titled "[S8E9] Phantoms" in the Stargate franchise—where the episode "Phantoms" is actually of Stargate Atlantis —the title [S8E9] Phantoms corresponds directly to an episode of The Flash . [S8E9] Phantoms
Below is an essay analyzing the themes and narrative structure of Echoes of Grief: An Analysis of The Flash S8E9 "Phantoms" If you were actually looking for the Stargate