Gwendolyn "Gwen" Tennyson, also known as Lucky Girl, is a fictional character of the Ben 10 franchise. The paternal first cousin and best friend of title protagonist Ben Tennyson, she was created for Ben 10 (2005–2008), in which she was voiced as a 10-year-old by Meagan Smith, with Tara Strong as her future version. Smith was replaced by Ashley Johnson for the sequel series Ben 10: Alien Force (2008–2010), Ben 10: Ultimate Alien (2010–2012), and Ben 10: Omniverse (2012–2014), with Montserrat Hernandez voicing the character in the rebooted Ben 10 (2016–2021).
