El pensador
Kenneth Soona aka The Thinker (Bernie Coulson) – an unofficial fourth member, a computer hacker, who succeeded in accessing Majestic 12 files and encrypting them onto a digital tape in the season 2 finale of the "X-Files" titled "Anasazi". The Thinker first appeared in the season 2 episode titled "One Breath". The Thinker was killed by assassins working for the Cigarette Smoking Man, who eventually re-acquired the tape. He was referred to in the first episode of season 3 titled "The Blessing Way" as being murdered, but he was not in that episode.