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Annabelle Johnson is Jeremy and Suzy's long lost cousin. She apperars in the Phineas and Ferb episode Run, Candace, Run and she is voiced by Tina Fey.
Annabelle is a young businesswoman, who wants to buy the Doofenshmirtz Evil Incorporated building. She had a husband, fiancé or boyfriend with whom she was looking for a new home. After Candace carries her to the Johnson's family meeting by her pair of boots that make the wearer extraordinarily fast, it is revealed that Annabelle is a long-lost member of Johnson family. It is implied that she dropped an anvil on her head while working, which caused amnesia. She was recognized by Hildegard Johnson, because of her birthmark (a letter "J") ("Run, Candace, Run"). It is unkown if she decided to stay together or break up/divorce her husband/fiancé/boyfriend after she regained her memory of being a Johnson.