Inga Bittersweet appeared in "Passion Patties".
Dr. Bittersweet was former a Happy Girl (a parody of the Girl Scouts) as a child, but then her troop expelled her out for eating the cookies instead of selling them. She then spent the next twenty years planning her revenge.
She developed a highly concentrated sugar extract and used the formula in her own brand of cookies called Passion Patties (a parody of the Girl Scout cookie), and anyone who ate them was instantly addicted to them. The extract was also fattening enough to cause obesity within a day (judging from Shirley Rogers, Jerry Lewis, and Clover's change in appearance). Dr. Bittersweet soon used her Passion Patties to dominate the cookie market.
The cookie craze quickly caught the attention of Jerry, who sent Samantha, Alexandra, and Clover to investigate and stop her scheme. During the infiltration of her production factory she caught them and hooked them up to an automatic feeding machine to sumo size them. As she gloated about her imminent victory, Clover (who ate the cookies and had become sumo sized) managed to sneak a homing device onto Inga, which led the spies to her Arctic storage facility.
The girls tracked her down and defeated her by forcing her to drink a vial of her sugar extract. She inflated to Clover's size in seconds, and the girls left her to eat the cookies until Jerry arrived.
She makes a cameo in "Evil Jerry".
- Inga's name is a reference to Bittersweet chocolate.
- During her fight with Sam, Inga is seen using Jeet Kune Do as her fighting style to kick Sam with a flying kick.