Doctor: So, that's the trap. Or the test or the final judgment, I don't know. But if I kill you, I kill her. Except that implies, in this big grand scheme of Gods and Devils, that she's just a victim. But I've seen a lot of this universe. I've seen fake gods and bad gods and demi-gods and would-be gods - out of all that - out of that whole pantheon - if I believe in one thing... Just one thing... I believe in her.
As the camera zooms out when Rose is captured and Cassandra is about to "go" into Rose, the psychograft disappears, but in the next shot of Rose it appears again.
"Torchwood" is an anagram for Doctor Who. Russell T Davies came up with it during the filming of Series 1 to label the tapes in order to prevent theft and potential leakage, and decided to use the name in the show proper.