Legion (10 p.m., FX) — Unlikely alliances form in the Season 2 premiere, and the search begins for the Shadow King.
Also on tonight . . .
The Voice (8 p.m., NBC) — Knockouts continue. Past winners Cassadee Pope, Jordan Smith, Chris Blue and Chloe Kohanski return as advisers.
Roseanne (8 p.m., ABC) — Dan tries to help Roseann with her bad knee by getting her an elevator chair.
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Black America Since MLK: And Still I Rise (9 p.m., UNC-TV) — Interviews and archival footage tell the story of the struggle for black equality, with insights from Jesse Jackson, Nas and Donna Brazile.