'The Mod Squad,' 'Adam-12' and how TV brought the counterculture into 1968's cop shows

“One black, one white, one blonde” was the tagline for a new kind of cop show that premiered in 1968 on the heels of Vietnam’s bloody Tet Offensive, the Rev. Martin Luther King Jr.’s assassination, a shootout between the Black Panthers and Oakland police and the passage of the Fair Housing Act.