Sadie

Sadie is the holographic driver Arcee projects in order to remain disguised from humans.

"Darkness Rising, Part 1"
Arcee activated Sadie while roving Jasper. She later turned her off, shortly before Jack appeared.

"Convoy"
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.

"Orion Pax, Part 1"
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.