Clarissa is a major character and antagonist from the twelfth Goosebumps book, Be Careful What You Wish For..., and its television adaptation. She also appears in the 2015 Goosebumps film as a minor antagonist. Clarissa is a witch, described as having both young and old physical features. After Samantha Byrd helps the woman return home, Clarissa grants the seventh-grader three wishes, but vaguely warns her about their potential consequences and the overall complications of magic. Once Samantha wishes for Judith to disappear, Samantha finds herself alone, with nobody in sight.