Tonight’s Picks

SIREN FREEFORM 8:00 p.m.

When Ben (Alex Roe) and Xander (Ian Verdun) secretly take the North Star out to catch a mermaid, things go awry in this new episode. A mysterious young woman wreaks havoc on a small fishing town once known for being home to mermaids in this drama.

ARROW (15) WCWN 9:00 p.m.

As Oliver (Stephen Amell) continues his quest to save the people of Star City, he begins to wonder if he’s on the verge of losing everything in this new episode. Meanwhile, a familiar face returns. Colin Donnell guest stars.

CHAMPIONS (13) WNYT 9:30 p.m.

While Michael (J.J. Totah) gets ready for his first date, Matthew (Andy Favreau) and Vince (Anders Holm) prepare to expand the gym in a new episode of this freshman comedy. An offer comes to light that could change everyone’s lives forever.

S.W.A.T. (6) WRGB 10:00 p.m.

A specialized tactical unit tackles the most dangerous assignments in Los Angeles in this new drama. Shemar Moore stars as former Marine Daniel “Hondo” Harrelson, a S.W.A.T. leader who risks his life to protect his community.

GRACE VS. ABRAMS A&E 11:05 p.m.

Legal analysts Nancy Grace and Dan Abrams discuss the Laci Peterson case in front of a live studio audience in this new episode. Peterson’s husband, Scott, was convicted of her murder in 2004, and is currently on Death Row.