Numbuh 23 a.k.a. Virginia Sims was one of the girls at Numbuh 86's slumber party in Operation: S.L.U.M.B.E.R. Like the others, she assists in stopping an attempt to steal the Code Module by the Teen Ninjas after Numbuh 12 betrays the KND. However, she does not participate in the fight much. During the party, she asks Numbuh 3 to tell them whether or not she "like-likes" Numbuh 4. Her specialty is incendiary confectionary munitions, and was once responsible for blowing up half of the deep sea science lab while trying to develop a long distance sour ball cannon.