|"Thought I ditched you." — Carmen Cortez|
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Rebecca Willson is Cecil Willson's trouble-making twin sister who has a contentious relationship with Marissa Cortez Wilson, her step-mother who she dislikes at the beginning. Her father is Wilbur Wilson, a TV actor and spy hunter. When Marissa leaves a necklace that The Timekeeper wants with Rebecca, she and Cecil team up with their step-cousins, Juni and Carmen, to save their parents.
She always pulls pranks on her dad and everyone else, angering them and can do good inventions and machinery for her pranks. Rebecca used this prank advantage to defeat some of The Timekeeper's servants by blasting them off. Her gadget is a purple electric whip and other gadgets stored in a purse. She accepts Marissa as her mother and likes her for who she is. She's played by Rowan Blanchard.
Spy Kids 4: All the Time in the World
- She seems to be very strong as she punches Cecil in the arm and he says "ow".
- It is currently unknown what the age gap between Rebecca and Cecil is. Whether Rebecca is the older twin or the younger twin, it has not yet been confirmed.