On May 19, 2018, Flanagan's band was one of four classic punk/hardcore acts to play the Prudential Center in Newark, New Jersey, along with Murphy's Law, Suicidal Tendencies, and the Original Misfits. Flanagan also released two recordings: "The Dr. Know EP", proceeds of which benefit the titular Bad Brains member, who has medical expenses; and, released on July 6, 2018, "The Original Cro-Mags Demos, 1982/83", which documents Flanagan's work writing the songs, playing all instruments and singing early versions of the songs that are blueprint for the Cro-Mags sound. That same year, Flanagan filed a federal trademark infringement action against former Cro-Mags bandmates, John Joseph and Mackie Jayson who had been touring under the Cro-Mags band name with other musicians against Flanagan's wishes.