is the holographic driver Arcee
projects in order to remain disguised from humans
Arcee activated Sadie while roving Jasper. She later turned her off, shortly before Jack appeared.
Sadie was active on Arcee during their battle with MECH. She was only turned off when the Autobots were forced to transform to battle a group of Vehicons.
When Sierra saw Sadie on Jack Darby's motorcycle (Arcee), Jack lied and said it was his mother. Sierra didn't appear to believe him.
- Sadie was given a name in "Darkness Rising, Part 1".