Dirk Gently’s Holistic Detective Agency Dirk (Samuel Barnett ) and Todd (Elijah Wood) grapple with hostile natives and a menacing force of evil knights in this new episode of the fantastical series. 9 p.m. BBC America
Welcome to Sweetie Pie’s This reality series about a family-run soul-food restaurant in St. Louis is back for another season. 9 p.m. OWN
Killer Women With Piers Morgan The true-crime series about femmes fatale offers its season finale. 10 p.m. Investigation Discovery
Robbie the Reindeer in Hooves of Fire Ben Stiller, Hugh Grant and Britney Spears lend their...