Season 7 Episode 15 - Chimera

Daniel is haunted by dreams of his ex-girlfriend Dr. Sarah Kane, who was taken over by the Goa'uld System Lord Osiris. He's unaware that Osiris is actually teleporting in and using a memory-tapping device to scan his subconscious and get him to translate a tablet leading to the Lost City. Daniel soon realizes something is amiss but they go ahead so that Daniel can actually determine the Lost City's location.

Meanwhile, Sam begins a relationship with a cop, Pete Shanahan, who soon becomes leery of the secrecy of her work. Pete has a secret of his own – he's an FBI agent suspicious of her cover story. When Sam's background turns out to be a blank Pete follows her and sees SG-1 staking out Daniel's house and jamming the transporter technology to capture Osiris. When she tries to kill Daniel the team moves in as Pete confronts Sam and he's hurt in the crossfire before they can knock out Osiris. They remove the Goa'uld from Sarah and Sam tells Pete everything.