Threshold
Crossovers
Unhaunted House by Susan M. M
Sam and Dean Winchester check out rumors of a haunted house, and find a monster they're never seen before. Can Agent Cavennaugh catch an alien infectee without letting the Winchester brothers learn the secret of Project Threshold? (Strong T, borderline M)
Crossover - Supernatural & Threshold - Rated: T - English - Supernatural/Sci-Fi - Chapters: 1 - Words: 1,885 - Favs: 2 - Published: 6/15/2014 - Sam W., Dean W. - Complete
Small Problem by Susan M. M reviews
Cassie, Shane, and D. D. must prevent the assassination of King Otto of Wachovia. Guest starring Dr. Arthur Ramsay from Threshold.
Crossover - She Spies & Threshold - Rated: T - English - Adventure/Friendship - Chapters: 1 - Words: 4,029 - Reviews: 2 - Favs: 1 - Follows: 1 - Published: 6/19/2011 - Complete
Breaking Protocol by milady dragon reviews
ONE SHOT Ever wonder where Molly came up with the idea for a protocol for an alien invasion? crossover with the Tomorrow People
Crossover - Tomorrow People & Threshold - Rated: K+ - English - Sci-Fi/Drama - Chapters: 1 - Words: 1,313 - Reviews: 3 - Published: 2/8/2007 - Complete