“dancing with the stars” (8 p.m., abc): The glitzy cheese-fest known as “Dancing

“dancing with the stars” (8 p.m., abc): The glitzy cheese-fest known as “Dancing With the Stars” waltzes back into prime time as 12 new celebrities take to the ballroom floor. Among those hoping to avoid spraining their ankle or pulling a hamstring are Melissa Gilbert, Jaleel White, Gladys Knight, Martina Navratilova and Donald Driver.

“pretty little liars” (8 p.m., abc): After two long years, the young ladies of Rosewood finally come face-to-face with “A” on the season finale of “Pretty Little Liars.” But before they meet their evil tormentor, they must endure another game of cat-and-mouse during a masquerade ball crammed with killer costumes.

TV listings, B6