Gwen Tennyson appears in 49 episodes in this series.
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Episode #101
And Then There Were 10
December 27, 2005
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Episode #102
Washington B.C.
January 13, 2006
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Episode #103
The Krakken
January 14, 2006
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Episode #104
Permanent Retirement
January 21, 2006
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Episode #105
Hunted
January 28, 2006
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Episode #106
Tourist Trap
February 4, 2006
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Episode #107
Kevin 11
February 11, 2006
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Episode #108
The Alliance
February 18, 2006
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Episode #109
The Last Laugh
February 25, 2006
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Episode #110
Lucky Girl
March 4, 2006
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Episode #111
A Small Problem
March 11, 2006
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Episode #112
Side Effects
March 18, 2006
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Episode #113
Secrets
March 25, 2006
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Episode #201
Truth
May 29, 2006
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Episode #202
The Big Tick
May 30, 2006
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Episode #203
Framed
May 31, 2006
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Episode #204
Gwen 10
June 1, 2006
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Episode #205
Grudge Match
June 7, 2006
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Episode #206
The Galactic Enforcers
June 13, 2006
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Episode #207
Camp Fear
June 21, 2006
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Episode #208
Ultimate Weapon
July 6, 2006
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Episode #209
Tough Luck
July 12, 2006
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Episode #210
They Lurk Below
July 18, 2006
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Episode #211
Ghostfreaked Out
July 25, 2006
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Episode #212
Dr. Animo and the Mutant Ray
August 26, 2006
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Episode #213
Back With a Vengeance
October 9, 2006
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Episode #301
Ben 10,000
November 25, 2006
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Episode #302
Midnight Madness
December 2, 2006
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Episode #303
A Change of Face
December 9, 2006
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Episode #304
Merry Christmas
December 11, 2006
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Episode #305
Benwolf
February 17, 2007
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Episode #306
Game Over
February 24, 2007
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Episode #307
Super Alien Hero Buddy Adventures
February 24, 2007
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Episode #308
Under Wraps
March 10, 2007
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Episode #309
The Unnaturals
March 17, 2007
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Episode #310
Monster Weather
March 24, 2007
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Episode #311
The Return
April 7, 2007
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Episode #312
Be Afraid of the Dark
April 14, 2007
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Episode #313
The Visitor
April 21, 2007
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Episode #401
Perfect Day
July 14, 2007
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