Who Do You Think You Are?
BBC1, 9pm
There's plenty of drama tonight as actor Larry Lamb (left), best known as former EastEnders baddie Archie Mitchell, encounters a long-lost relative in America he never knew existed.
He delves deep into his ancestry, focusing his attention on his orphaned mum who was adopted as a baby. Little is known of her birth parents, but the maternal line throws up many surprises.