Curtin left Impact in October 2017 and signed a contract with WWE that same month. He would be named as the on-screen General Manager of 205 Live, the brand created by WWE for their cruiserweight division (205 lbs. and under), and served for a brief time as the manager of AOP on "Raw". In 2019, he became more active as an in-ring competitor, becoming a six-time 24/7 Champion. He was released from the company in April 2020 due to budget cuts resulting from the COVID-19 pandemic. Following his release, WWE still had Curtin compete in the multi-month Interim NXT Cruiserweight Championship tournament. After losing the finals, he was given a new WWE contract, signalling his return to the promotion.