Caffrey's Threshold plan calls for the formation of a secret government task force known as the Red Team. As a result, several top scientists are seconded: Dr. Nigel Fenway (Brent Spiner), an individualistic NASA-employed microbiologist; Lucas Pegg (Rob Benedict), a somewhat unsure-of-himself aerospace engineer on the eve of his marriage, and Arthur Ramsey (Peter Dinklage), a mathematics and linguistics genius with a penchant for unpredictability, alcohol and women. Caffrey's government liaison is Deputy National Security Advisor J.T. Baylock (Charles S. Dutton), while freelance paramilitary operative Sean Cavennaugh (Brian Van Holt) serves as the "muscle" of the group (and apparent potential love interest for Caffrey). Daphne Larson (Catherine Bell) was added to the team in the episode "Outbreak". Caffrey's team works under absolute secrecy, their activities not even known to the Vice-President, or the Joint Chiefs of Staff.