WE tv next month will launch the sixth and final season of its reality documentary series Mary Mary.The series, which chronicles the lives of sisters Erica and Tina Campbell of the gospel music group Mary Mary, will debut its sixth season Sept. 28, said network officials. Mary Mary is going out on a high note. The fifth season drew 12.7 million total viewers and was the No. 1 cable program in its time slot among African-American Women 25-54, according to WE tv and Nielsen stats.