Research Unit / Season 1 Season guide Research Unit: Season 1 4 episodes Premiered May 11, 2006 Updated Jul 23, 2026 Spoiler-safe Advertisement Episodes S1·E1 Episode 1 May 11, 2006 · 52 min S1·E2 Episode 2 May 11, 2006 · 54 min S1·E3 Episode 3 May 18, 2006 · 55 min S1·E4 Episode 4 May 18, 2006 · 48 min