MSPCA-Angell Headquarters (350 South Huntington Avenue, Jamaica Plain, 617.522.7400) to see Food, Inc., the first installment of the Massachusetts Society for the Prevention of Cruelty to Animals’ Free Film Series. The documentary about the health risks, ethical quandaries, and environmental issues involved in America’s large-scale food-manufacturing processes was widely acclaimed when it was released last summer. Narrated by Fast Food Nation author Eric Schlosser and The Omnivore’s Dilemma writer Michael Pollan, the movie devotes itself in large part to the industrial production of meat, stepping inside factory farms and slaughterhouses to question their treatment of animals. Another free flick in the series is The Cove, a 2009 Sundance Film Festival winner that follows a dolphin trainer’s quest to expose Japanese dolphin hunting; it screens on Thursday, January 21. Both movies start at 6:30 p.m., and RSVPs are requested here. Potential tear-jerkers? Yes. But we think we owe it to our four-legged (or finned!) friends to check them out.