The Pumpkin KingEdit
Igor was first shown when he ran off and accidently locked Dr. Finkelstein out of the lab. When the bugs drove the security system wild, he was captured. Jack fights his way through the lab to destroy the bug that's damaging the control box, and thus set Igor free. Afterwards, he returns to the doctor and lets him back in.
Oogie's Revenge Edit
Igor is first met when Jack goes to investigate Dr. Finkelstein's strange behavior. He tells Jack that he cannot let him in, as for the Doctor's orders. Jack offers to get Igor a box of Bone Biscuits if he lets him in. After Igor gets his biscuits, he helps Jack disable the electrode machine guarding the doctor's lab.