TV TOP PICKS

7 p.m. on CW

Swamp Thing

When her colleague and friend Harlan (guest star Leonardo Nam) comes down with the “green flu,” Abby (Crystal Reed, pictured) turns Alec’s (Andy Bean) lab upside-down looking for a cure in the new episode “He Speaks.” Instead, she finds the latest supernatural reanimation from the Rot. Virginia Madsen, Henderson Wade and Derek Mears also star.

8 p.m. on PBS

American Masters

Filmmaker Ben Loeterman’s new documentary Walter Winchell: The Power of Gossip chronicles the life and career of the syndicated columnist, radio news commentator and TV host who created the breakneck, gossip-based, politically charged culture that still thrives today. At his career peak, he had a combined print and radio audience of 50 million, until his alliance with Sen. Joseph McCarthy turned fans against him. Stanley Tucci, who won an Emmy in the title role of HBO’s 1998 TV-movie Winchell, lends his voice to the film.

8:30 p.m. on FREE

Kal Penn Approves This Message In a new episode called “Kal Penn Approves the Environment,” host Kal Penn continues his personal crusade to inform and empower young voters by spending time discussing environmental policies with young Americans from all sectors of the political spectrum. With luck, he hopes to discern whether and how age may be a greater dividing factor than political affiliation for this particular voting demographic.

9 p.m. on NBC

Transplant

In the new episode “Far From Home,” an unexpected turn of events leaves Bash and Amira (Hamza Haq, Sirena Gulamgaus) in a precarious situation. Elsewhere, Theo (Jim Watson) gets a surprise visitor at home, while at work he confronts a stubborn, closed-minded patient. Language proves to be a barrier as Bash and Mags (Laurence Lebeouf) team up to help a patient from overseas. Meanwhile, June (Ayisha Issa) comes to a decision about her relationship with Lou (Eddie G).