Alexa Helen Nikolas (born April 4, 1992) is an American actress. She is best known for her role as Nicole Bristow on the Nickelodeon television series Zoey 101. Nikolas has also appeared on various other series, including ER, Without a Trace, Ghost Whisperer, Criminal Minds, The Walking Dead, and Lie to Me.
Nikolas's most prominent role is that of Nicole Bristow on the Nickelodeon television series Zoey 101, alongside Jamie Lynn Spears. In 2006, following the conclusion of the second season, Nikolas quit the series due to an "uncomfortable working environment" following numerous fights and incidents with Spears
In addition, Nikolas appeared on Hidden Hills regularly and also on the 2005 mini-series Revelations. Following her departure from Zoey 101, Nikolas guest starred on various other television series, most notably The Suite Life of Zack & Cody, Judging Amy, ER, Without a Trace, Criminal Minds and Heroes.
Nikolas appeared in a supporting role alongside Vanessa Hudgens in the latter's music video, "Come Back to Me". Nikolas appeared in the films Motocross Kids and Tiptoes. In 2009, she appeared in the remake of Children of the Corn, playing the role of the love interest of one of the antagonists.
She also guest starred on Fox's Lie to Me. In 2011, she appeared in the film Red State as Jesse, and that same year she appeared on Family Guy as additional voices. In spring of 2011 she filmed a zombie-comedy-horror film "Detention Of The Dead" and she plays Willow. The film is set for a spring 2013 release.
She will appear in the long-awaited 2013 film "Into The Darkness" as Elsa. Nikolas got the recurring role of Haley in the television series The Walking Dead. She appeared in November 2012, and her character was killed off in February 2013. She appeared in 3 episodes total.
Nikolas gained controversy when pictures leaked online kissing singer Vanessa Hudgens