Echo is a soldier of the 501st Legion and the last surviving member of Domino Squad. He is a supporting character in Star Wars: The Clone Wars and one of the two tritagonists (alongside Crosshair) of its 2021 spin-off/sequel Disney+ series Star Wars: The Bad Batch. He, Fives, and three other clone cadets were members of Dominod Squadron before he joineed the Clone Force 99.