• Regina George: Regina is the main antagonist and leader of the Plastics, who manipulates others to maintain her dominance. Her beauty, wealth, and toxic behavior makes her feared and admired by her peers. Regina works to transform Cady into a Plastic.

• Grethcen Wieners and Karen Smith: Grethcen and Karen are Regina's loyal followers. Gretchen is insecure and constantly seeks Regina's approval. She is the yes-man of the group, but eventually betrays Regina by revealing her secrets out of frustration of living in Regina's shadow. Karen is portrayed as sweet but dumb. She is kind-hearted but easily influenced. She doesn't exhibit mean tendencies, she is the more innocent character in the group and part of the comic relief.

• The major conflict is Cady's struggle with identity as she gets involved with the Plastics and becomes more like Regina. The resolution occurs when Cady apologizes for her insensitive behavior, takes responsibility, and restores her friendships which helps not only her but also the school environment.

• Erik Erikson was a German developmental psychologist born on June 15, 1902. Erikson developed his eight-stage theory of psychosocial development in the mid-20th century. Each stage involves a central conflict or "crisis" that must be resolved for healthy psychological development. Erikson emphasized the importance of social experiences and interactions in shaping an individual’s identity throughout life.       

• Infancy: Trust vs. Mistrust 

• Early Childhood: Autonomy vs. Shame and Doubt 

• Preschool: Initiative vs. Guilt 

• School Age: Industry vs. Inferiority 

• Adolescence: Identity vs. Role Confusion

• Young Adulthood: Intimacy vs. Isolation 

• Middle Adulthood: Generativity vs. Stagnation

• Older Adulthood: Ego Integrity vs. Despair 

As explained in My Psychology (Pomerantz, 2018), Erikson's stage of Identity vs. Role Confusion is a critical phase during adolescence, making it the most relevant stage to Cady's development. This focuses on the exploration of identity and societal roles which coincides with Cady’s journey in “Mean Girls” as she seeks her place in high school.

• Erikson’s theory supports the idea that human development is a lifelong process. He believes that each stage of life offers a unique crisis or challenge that must be resolved for the next stage to occur without difficulty.

• Critics consider Erikson's theory to be vague and oversimplified as it divides development into distinct stages ignoring human complexity. Some argue that the theory is culturally biased as it applies primarily to Westerners since independence and personal identity is highly valued to them. In addition to culture surrounding traditional behavior for boys and girls. The theory addresses things that are considered too masculine in certain places like independence and assertiveness,

makes her vulnerable to social pressures, and her desire to fit in with the popular group leads her to adopt behaviors that conflict with her authentic self. 

https://www.imdb.com/title/tt0377092/plotsummary/- setting, plot, characters

https://www.verywellmind.com/erik-eriksons-stages-of-psychosocial-development-2795740 - stages

https://www.psychologytoday.com/us/blog/the-forgiving-life/202104/why-erik-eriksons-psychosocial-theory-is-not-quite-right - critiques

Pomerantz, A. M. (2018). My psychology (2nd ed.). Worth Publishers.