Jack Mason (003) is a fictional intelligence operative of the 'Double-O' ('00') Branch, an ultra-covert Black Ops unit within the British Secret Intelligence Service (SIS/MI6). The character appeared in the 2004 James Bond video-game Everything or Nothing and was voiced by James Arnold Taylor. To date, across the James Bond franchise as a whole, there have been two individuals who have held the number 003.
Virtually nothing is known about agent 003. in the video game Everything or Nothing he is simply referred to as "Jack", however there is verification that his last name is "Mason". Just before his death, via gunshot by Nikolai Diavolo, he was confirmed as being in a romantic relationship with Serena St. Germaine.