While in the Squad, Harkness also briefly took up the mantle of Mirror Master to commit robberies. However, this career was cut short when he was caught and brought to Waller, who put an end to it by tricking him into a fake assault scene where he was forced to change constantly between Mirror Master and Captain Boomerang. She rescinded the benefits Harkness had been given such as his apartment in New Orleans and his status as a voluntary member of the Squad.