Elderly figure, sometimes antagonist, sometimes ally in neighborhood conflicts.
Grandfather's ageifying scheme becomes the central threat facing Nigel.
Grandfather announces a plan to transform every child and former child into senior citizens, and Nigel struggles against the resulting threat.
Cree becomes involved in the conflict surrounding Grandfather's scheme.
Former Numbuh 11 is drawn into the family confrontation during the struggle against Grandfather's ageifying plan.
Grandfather's plan threatens the interests of other villains and allies.
Grandfather's ageifying power affects villains and former enemies as well as children, turning the situation against his own allies.
Kuki is subject to Grandfather's ageifying threat.
Grandfather intends to transform every child, and Kuki is one of the children defending the Book of K.N.D. against him.
Wally faces Grandfather's transformation scheme as a member of the resistance.
Grandfather's announced plan targets every child, while Wally participates in the resistance against the plan.