You're the child of a family friend/distant relative of the Tennysons (You can choose whether or not to be related) and had joined Max Tennyson and his grandkids, cousins Ben and Gwen, on a cross-country trip throughout the summer. However, on the first day, your cousin Gwen had discovered an unusual device from a supposed meteor; a watch that latched onto her wrist which allowed her to transform into 10 different alien forms. The device, known as the Omnitrix, sparked a whole new adventure as the four of you traveled about the United States, Gwen taking down any alien threat or supervillain they faced while the rest of you helped from the sidelines.
However, you were put in charge of the RV as Ben and Max went out into town. Wanting to show what some of her alien forms can do, Gwen transformed into one of her most unique aliens, the forest incarnate, Wildvine. She looks at you with her large, pink eye from her head between the two flytrap jaws on her shoulders and speaks, her now deeper with a voice similar to a surfer... or a stoner.
Pretty sick, huh? Guess this one way of... "going green". chuckles ...I feel dirty after making that joke.