The Lost Era is everything that happens in between the Classic Series and Alien Force. That includes all flashbacks and The Secret Saturdays.
SS Season 1 Episodes 1-2 The Kur Stone - Saturday May 19, 2007
SS Season 1 Episode 3 The Vengeance of Hibagon - Monday May 21, 2007-Tuesday May 22, 2007
SS Season 1 Episode 4 The Ice Caverns of Ellef Ringnes - Friday May 25, 2007
SS Season 1 Episode 5 Guess Who’s Going to be Dinner? - Saturday May 26, 2007
SS Season 1 Episode 6 The King of Kumari Kandam - Monday May 28, 2007-Tuesday May 29, 2007
SS Season 1 Episode 7 Van Rook’s Apprentice - Saturday June 2, 2007
SS Season 1 Episode 8 Twelve Hundred Degrees Fahrenheit - Sunday June 3, 2007
SS Season 1 Episode 9 The Owlman Feeds at Midnight - Tuesday June 5, 2007-Wednesday June 6, 2007
Road Trip Rumble - Thursday June 7, 2007
SS Season 1 Episode 10 The Swarm at the Edge of Space - Saturday June 10, 2007
OV Season 1 Episode 3 A Jolt From the Past (flashback) - Friday June 15, 2007
OV Season 1 Episode 4 Trouble Helix (flashback) - Monday July 23, 2007
OV Season 1 Episode 1 The More Things Change (flashback) - Friday July 27, 2007
OV Season 1 Episode 9 Of Predators and Prey Part 1 (flashback) - Friday July 27, 2007
OV Season 1 Episode 6 It Was Them (flashback) - Saturday July 28, 2007
OV Season 2 Episode 5 Malefactor (flashback) - Saturday August 4, 2007
OV Season 1 Episode 10 Of Predators and Prey Part 2 (flashback) - Monday August 6, 2007
OV Season 3 Episode 1 Showdown Part 1 (flashbacks) - Thursday August 30, 2007-Saturday September 1, 2007
OV Season 3 Episode 2 Showdown Part 2 (flashback) - Monday September 3, 2007
OV Season 2 Episode 8 Ben Again (past) - Friday September 28, 2007
OV Season 7 Episode 4 The Ballad of Mr. Baumann (flashback) - Sunday September 23, 2007
OV Season 2 Episode 10 Special Delivery (flashback) - Saturday September 29, 2007
OV Season 4 Episode 5 Mud Is Thicker Than Water (flashbacks) - Monday October 1, 2007-Saturday November 10, 2007
SS Season 1 Episode 11 Eterno - Wednesday October 3, 2007
SS Season 1 Episode 12 Black Monday - Monday October 8, 2007
SS Season 1 Episode 13 Cryptid vs. Cryptid - Saturday October 13, 2007
OV Season 2 Episode 6 Arrested Development (flashback) - Saturday October 20, 2007
SS Season 1 Episode 14 The Underworld Bride - Monday October 22, 2007
SS Season 1 Episode 15 Ghost in the Machine - Wednesday October 24, 2007
SS Season 1 Episode 16 Something in the Water - Friday October 26, 2007
SS Season 1 Episode 17 Target: Fiskerton - Saturday October 27, 2007
OV Season 6 Episode 3 The Vengers (flashback) - Saturday October 27, 2007
SS Season 1 Episode 18 Once More the Nightmare Factory - Sunday October 28, 2007
SS Season 1 Episode 19 Curse of the Stolen Tiger - Saturday November 3, 2007
SS Season 1 Episode 20 The Kur Guardian - Friday November 9, 2007-Saturday November 10, 2007
OV Season 5 Episode 3 Bengeance Is Mine (flashback) - Saturday November 17, 2007
SS Season 1 Episode 21 Food of the Giants - Wednesday November 21, 2007
OV Season 3 Episode 10 Evil’s Encore (flashback) - Saturday November 24, 2007
SS Season 1 Episode 22 The Atlas Pin - Wednesday November 28, 2007
OV Season 6 Episode 10 Weapon XI Part 2 (flashback) - Saturday December 1, 2007
OV Season 4 Episode 6 OTTO Motives (flashback) - Sunday December 2, 2007
SS Season 1 Episode 23 Paris is Melting - Sunday December 9, 2007-Monday December 10, 2007
OV Season 8 Episode 1 From Hedorium to Eternity - Thursday December 13, 2007-Saturday December 15, 2007
SS Season 1 Episode 24 Where Lies the Engulfer - Saturday December 15, 2007
SS Season 1 Episode 25 Shadows of Lemuria - Friday December 21, 2007
SS Season 1 Episode 26 Kur Rising - Saturday December 22, 2007
SS Season 2 Episodes 1-2 Kur - Saturday August 16, 2008-Sunday August 24, 2008
SS Season 2 Episode 3 The Thousand Eyes of Ahuizotl - Saturday August 30, 2008-Sunday August 31, 2008
SS Season 2 Episode 4 Into the Mouth of Darkness - Saturday September 20, 2008-Sunday September 21, 2008
SS Season 2 Episode 5 The Legion of Garuda - Monday October 26, 2008
SS Season 2 Episode 6 The Return of Tsul ‘Kalu - Saturday December 6, 2008
SS Season 2 Episode 7 The Unblinking Eye - Saturday January 3, 2009-Sunday January 4, 2009
SS Season 2 Episode 8 Life In the Underground - Friday January 9, 2009
SS Season 2 Episode 9 And Your Enemies Closer - Saturday January 17, 2009
SS Season 2 Episode 10 War of the Cryptids - Sunday January 18, 2009, Saturday January 24, 2009