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When We Rise - Michael K. Williams Joins Cast; Whoopi Goldberg, Denis O'Hare & More to Guest

ABC is pulling out all the stops for its upcoming gay rights miniseries When We Rise.

The Dustin Lance Black entry has added alum Michael K. Williams as a series regular and tapped an impressive guest list that includes Whoopi Goldberg, Rosie O'Donnell, Denis O'Hare and David Hyde Pierce.

When We Rise chronicles the personal and political struggles, setbacks and triumphs of a diverse family of LGBT men and women who helped pioneer one of the last legs of the U.S. civil rights movement, from its turbulent infancy in the 20th century to the once-unfathomable successes of today.

Williams (The Wire, Boardwalk Empire) will co-star as African-American community organizer Ken Jones, while newcomer Ivory Aquino will portray the role of transgender activist Cecilia Chung.

Goldberg will take on the part of Pat Norman, the first openly gay employee of the San Francisco Health Department; O'Donnell is set as Del Martin, co-founder of the first lesbian organization in the country; O'Hare will take on Jim Foster, an openly gay Democratic party organizer; and Pierce is set as Dr. Jones, Cleve's (Guy Pearce) father.