Writer:	Alison Schapker, Monica Breen
Director:	Lawrence Trilling
Star:	David Anders (Sark),  Victor Garber (Jonathan 'Jack' Donahue Bristow),  Michael Vartan (Michael C. Vaughn),  Ron Rifkin (Arvin Sloane),  Carl Lumbly (Marcus R. Dixon),  Jennifer Garner (Sydney Anne Bristow),  Kevin Weisman (Marshall J. Flinkman),  Melissa George (Lauren Reed),  Greg Grunberg (Eric Weiss)
Recurring Role:	Amanda Foreman (NSA Agent Carrie Bowman)
Guest Star:	Justin Theroux (Simon Walker),  Ray Proscia (Laszlo Bodgen),  Elizabeth Penn Payne (Carolyn),  Fernando Jimenez (Police Officer),  Marco Zunino (Hotel Manager),  Carlos Del Olmo (Bouncer),  Clifton Collins Jr. (Javier Parez),  Timothy V. Murphy (Avery Russet),  Elena Evangelo (Princess Demetria)

Music from this episode includes:
"Fumba Rumba" by Chucho Merchan
"Emotion Lotion" by Chucho Merchan
"Kool As A Rool" by Chucho Merchan (edit)

Sydney: (to Vaughn) You never should have betrayed me. (Sydney stabs Vaughn) (edit) Sydney: Why did the NSC want me on this case?
Lauren: Actually, I requested you. Michael said you were the best. (edit) Sydney: No, what peaked his interest was Simon Walker calling me Julia and then kissing me like I was his prom date. (edit) Marshall: (holding a machine that could reveal the sex of his baby) You know, I could find out right now.
Carrie: Touch me with that thing and you die. (edit) Weiss: (about Sydney, to Michael) What ever she just did, man, she's good. She is really good. (edit)

Number 47: On the security system of the storage facility you can see the point SW9847. (edit) Towards the beginning Dixon, Marshall, Weiss, Vaughn, Sydney and Jack are all in the conference room talking about the virus the Covenant has. Sydney says that it is a level four pathogen which is the highest classification. Viruses are actually classified into groups followed by a Roman numeral. There are three categories: DNA viruses (groups one and two), RNA viruses (groups three-five), and Reverse transcribing virus (groups six-seven). Ebola falls under RNA viruses in group five. Also in group five are rabies, measles, and mumps. (edit) Marshall makes Vaughn into a midget! When editing the details on the Interpol database entry, he enters Vaughn's height as 1.60 meters. This is a common problem with lazy scriptwriters who have no conception of the metric system. 1.60 meters translates to 5'3, and the actor portraying Vaughn is in actuality 6' or 1.83 meters. (edit) Again in the scene where Sydney jumps from a high floor into a pool we expect to see two things happening, but they don't. First of all such a jump would force a lot of the pool's water to jump out as if a bomb exploded. That does not happen and we can only see the water's reaction as if someone from the ground level had just taken a plain dive. Also such jump with the above consequences should have first splashed all of the surrounding guests and even if that did not happen, it should have made them curious about the strange woman that has just jumped from a building floor inside the pool, half-naked, in the middle of a party. Yet we see no reaction and a man just gives her a towel as if everything is all right. (edit) Goof:
When Sydney steals the diamond necklace out of the hotel she jumps off the balcony into the pool and returns to the van where she shows the necklace which is around her ankle. However, in the shot where she jumps off the balcony there is no necklace around her ankle. In the first shot in the pool it isn't there either, but in the second shot in the pool the necklace suddenly appears around her ankle. However in the pool it was around her left ankle, in the van it is around her right ankle. (edit)

After Sydney reports about Vaughn being her supplier, Vaughn calls Marshall, where he picks up and says "Venkman Residence".

This was an allusion to the cult movie Ghostbusters where Peter Venkman, played by Bill Murray, is one of the parapsychologists part of the Ghostbusters. (edit)