Focuses on the climax of the Highbreed war in the two-part finale "War of the Worlds" .

Some notable episodes from the original series include:

| # | Episode Title | Airdate | |---|---------------|---------| | 27 | "Ben 10,000" | Sep 9, 2006 | | 28 | "Midnight Madness" | Sep 16, 2006 | | 29 | "A Change of Face" | Sep 23, 2006 | | 30 | "Merry Christmas" | Dec 10, 2006 | | 31 | "Benwolf" | Jan 13, 2007 | | 32 | "Game Over" | Jan 20, 2007 | | 33 | "Super Alien Hero Buddy Adventures" | Jan 27, 2007 | | 34 | "Under the Knife" | Feb 3, 2007 | | 35 | "The Unnaturals" | Feb 10, 2007 | | 36 | "Monster Weather" | Feb 17, 2007 | | 37 | "The Return" | Mar 3, 2007 | | 38 | "Be Afraid of the Dark" | Mar 10, 2007 | | 39 | "The Visitor" | Mar 17, 2007 |

Concludes with the series finale "Goodbye and Good Riddance" and leads into the movie Secret of the Omnitrix . 2. Ben 10: Alien Force (2008–2010)

| # | Episode Title | Airdate | |---|---------------|---------| | 14 | "Truth" | May 29, 2006 | | 15 | "The Big Tick" | May 30, 2006 | | 16 | "Framed" | May 31, 2006 | | 17 | "Gwen 10" (alternate timeline) | Jun 1, 2006 | | 18 | "Grudge Match" | Jun 2, 2006 | | 19 | "The Galactic Enforcers" | Jun 3, 2006 | | 20 | "Camp Fear" | Jun 4, 2006 | | 21 | "Ultimate Weapon" | Jun 5, 2006 | | 22 | "Tough Luck" | Jun 6, 2006 | | 23 | "They Lurk Below" | Jun 7, 2006 | | 24 | "Ghostfreaked Out" | Jun 8, 2006 | | 25 | "Dr. Animo and the Mutant Ray" | Jun 9, 2006 | | 26 | "Back with a Vengeance" | Jun 10, 2006 |