It is the best episode - but i'm getting annoyed by many characters on this show.... like Tilly. Hopefully she's killed off soon - because she's written as being one paranoid character without any redeeming qualities. She reminds me of Barklay, but that dude was written as having some genuine skills in the science/engineering department, so there was a reason to keep him around. And his paranoia was often humorous. That's not the case with Tilly.