On Demand movie highlights

Infernal Affairs

(Starz on Comcast) Martin Scorsese remade it as “The Departed,” but here’s the stylish original, a 2002 Hong Kong smash about two undercover moles, one in the police department (Tony Leung), the other among the criminals (Andy Lau). Instead of a blood-spattered action film, it’s a sleek, chic Michael Mann-style thriller that broods bewitchingly about identity and loyalty. (R; runs through Oct. 7)

Ty Burr

Secret Window

(Starz on Comcast) This jokey, junky potboiler centers on a hack novelist (Johnny Depp) accused of plagiarism by a Southern nut job (John Turturro). The writer and director is David Koepp, who wrote “Panic Room.” The source material is a Stephen King story, and it’s a confused parade of “gotcha” moments. But Depp is fun. (PG-13; runs through Nov. 30)

Once Upon a Time in Mexico ½

(Starz on Comcast) In the last, fatigued installment in Robert Rodriguez’s mariachi trilogy, Antonio Banderas reprises his role as vigilante guitar player, but seems like a supporting player in a cast that includes Mickey Rourke, Willem Dafoe, Danny Trejo, Salma Hayek, and (best of all) Johnny Depp. The whole thing should be a lot more exciting than it actually is. (R; runs through Nov. 30)