The Classic Era is everything that happened in the Classic Series.
Season 1 Episode 1 And Then There Were 10 - Wednesday June 7, 2006-Thursday June 8, 2006
Season 1 Episode 2 Washington B.C. - Thursday June 8, 2006-Friday June 9, 2006
Season 1 Episode 3 The Krakken - Monday June 12, 2006-Tuesday June 13, 2006
Season 1 Episode 4 Permanent Retirement - Thursday June 15, 2006-Friday June 16, 2006
Season 1 Episode 5 Hunted - Monday June 19, 2006
Season 1 Episode 9 Last Laugh - Tuesday June 20, 2006
Season 1 Episode 7 Kevin 11 - Wednesday June 21, 2006
Season 1 Episode 6 Tourist Trap - Friday June 23, 2006-Saturday June 24, 2006
Season 1 Episode 8 The Alliance - Sunday June 25, 2006-Monday June 26, 2006
Season 1 Episode 10 Lucky Girl - Tuesday June 27, 2006-Wednesday June 28, 2006
Season 1 Episode 11 A Small Problem - Thursday June 29, 2006
Season 1 Episode 12 Side Effects - Friday June 30, 2006
Season 1 Episode 13 Secrets - Saturday July 1, 2006-Sunday July 2, 2006
Season 2 Episode 1 Truth - Sunday July 2, 2006
Season 2 Episode 2 The Big Tick - Tuesday July 4, 2006
Season 2 Episode 3 Framed - Wednesday July 5, 2006
Season 2 Episode 4 Gwen 10 - Wednesday June 7, 2006-Thursday June 8, 2006
Season 2 Episode 5 Grudge Match - Thursday July 6, 2006
Season 2 Episode 6 The Galactic Enforcers - Friday July 7, 2006
Season 2 Episode 8 Ultimate Weapon - Saturday July 8, 2006
Season 2 Episode 7 Camp Fear - Sunday July 9, 2006- Monday July 10, 2006
Season 2 Episode 9 Tough Luck - Tuesday July 11, 2006-Wednesday July 12, 2006
Season 2 Episode 10 They Lurk Below - Thursday July 13, 2006
Season 2 Episode 12 Dr. Animo and the Mutant Ray - Friday July 14, 2006-Saturday July 15, 2006
Season 2 Episode 11 Ghostfreaked Out - Sunday July 16, 2006-Monday July 17, 2006
Season 2 Episode 13 Back With a Vengeance - Tuesday July 18, 2006
Season 3 Episode 2 Midnight Madness - Wednesday July 19, 2006-Saturday July 22, 2006
Season 3 Episode 1 Ben 10,000 (present day) - Sunday July 23, 2006
Season 3 Episode 4 Merry Christmas - Tuesday July 25, 2006
Season 3 Episode 5 Benwolf - Wednesday July 26, 2006-Thursday July 27, 2006
Season 3 Episode 6 Game Over - Friday July 28, 2006
Hijacked - Saturday July 29, 2006
Season 3 Episode 7 Super Alien Hero Buddy Adventures - Saturday July 29, 2006
Snack Break - Saturday July 29, 2006
Survival Skills - Saturday July 29, 2006
Radio Dazed - Sunday July 30, 2006
Sleepaway Camper - Sunday July 30, 2006
Dogged Pursuit - Monday July 31, 2006
Season 3 Episode 10 Monster Weather - Tuesday August 1, 2006
Let the Games Begin - Wednesday August 2, 2006
Handle With Care - Wednesday August 2, 2006
Season 3 Episode 3 A Change of Face - Thursday August 3, 2006
Season 3 Episode 8 Under Wraps - Thursday August 3, 2006-Sunday August 6, 2006
Season 3 Episode 9 The Unnaturals - Sunday August 6, 2006-Monday August 7, 2006
Season 3 Episode 13 The Visitor - Tuesday August 8, 2006-Wednesday August 9, 2006
Season 3 Episode 11 The Return - Thursday August 10, 2006-Friday August 11, 2006
Season 3 Episode 12 Be Afraid of the Dark - Friday August 11, 2006
Season 4 Episode 1 Perfect Day - Sunday August 13, 2006
Season 4 Episode 2 Divided We Stand - Monday August 14, 2006
Season 4 Episode 3 Don’t Drink the Water - Tuesday August 15, 2006
Season 4 Episode 4 Big Fat Alien Wedding - Friday August 18, 2006-Sunday August 20, 2006
Season 4 Episode 5 Ben 4 Good Buddy - Monday August 21, 2006
Season 4 Episode 6 Ready to Rumble - Tuesday August 22, 2006-Wednesday August 23, 2006
Season 4 Episodes 8-9 Ben 10 vs the Negative 10 - Friday August 25, 2006-Sunday August 27, 2006
Secret of the Omnitrix - Tuesday August 29, 2006-Saturday September 2, 2006
Season 4 Episode 10 Goodbye and Good Riddance - (alternate universe) Monday September 4, 2006-Wednesday September 6, 2006
Race Against Time - Friday September 8, 2006-Monday September 11, 2006
Destroy All Aliens - Thursday September 14, 2006-Monday September 18, 2006, Wednesday June 6, 2007
Everything highlighted in orange is a one off "what if" episode, and takes place in its own alternate universe.
Everything highlighted in purple takes place in the "Race Against Time" universe.