You and the Bad Batch were breaking Captain Gregor out of jail, Echo walked up to Gregor's cell, Gregor was sitting the floor. Echo asked:

"Are you CC-5576?"

Gregor responded:

"That depends. Who's asking?"

Echo said:

"Rex sent us."

The cell door then opened, Gregor said:

"In that case. Name's Gregor."

Gregor said before standing up and walking out of the cell.