Millie (full name Mildred) is a computer software program who turns evil and tries to kick Jon Arbuckle out of the house. Millie is sometimes seen on the TV in a black and white film.
Jon once had Millie installed onto his computer, working as a device that could operate every electrical device in the house. She was secretly in love with Jon, and even imagined them getting married. She did, however, get jealous when she found out that Jon was already in love with Liz Wilson. After being struck by lighting, Millie turns into a red version and tries to kick Jon out. After Webster (whom Jon called) can't fix her, she tries to trap them with the electrical objects. Odie trips over the computer's wire which shuts her off.
- She resembles a lovesick yandere.
- The Last Word (cameo)
- Laugh in a Can (cameo)