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Twins. Oh my, the notions we have. Oh, how the popular culture has struggled to portray twins – essentially, a matter of twins being either cute or evil.

My old dad, who is 91 next month, is a twin. His twin brother passed away a few years ago. They were never identical, but sometimes seemed close to it. Their voices were the same. If you were speaking to both on the phone, you couldn't tell one from the other.

They were dissimilar in many ways, mind you. In temperament and outlook, they were chalk and cheese. And yet, over the decades, the pattern of the relationship was always the same. They'd be close, then fall out and would barely speak for a while. Then they'd make up, become close and fall out again. Me, I've never understood it and know it was a impenetrable relationship.

Two of a Kind (Sunday, The Documentary Channel, 9 p.m.) is Leora Eisen's funny, wise and poignant doc about twins – the mystery of the emotional relationship and the science puzzle that is continuing about the connections between identical twins. This is the full-length version of the program seen on The Nature of Things on Nov. 27. That focused on the science, the differences between identical twins, rather than the similarities, and how some solid beliefs about genetics are now being rethought thanks to the study of twins.

This version is more about the vast complexity of emotional rapport between identical twins – issues of identity, mainly. Speaking about her sister Linda, Leora Eisen says: "It's hard to tell where 'we' ends and 'me' begins." Eisen points out that others look at identical twins and what they see is "magical, mysterious, troublesome." We see the visually arresting sight of the annual parade of twins in Montreal. And a psychologist in Los Angeles says: "There is envy among many people when they see twins. They see people who have found their soulmates." The psychologist specializes in dealing with twins who are having problems in their relationship with each other.

There is an unnerving scene of twins Alison and Lauren Knight eating in sync, every gesture matching the other's. They have written a book, Mirror Mirror, Two Bodies, One Soul. "We wish we were one person," one says. They have never spent more than four hours apart. We also meet a pair of English twins who perform together at Cirque du Soleil, their synchronicity being the bedrock of their performance. At the same time, they have different temperaments.

But it is the deeply personal and moving story of Leora Eislen and her sister Linda that is at the heart of this passionate, at times wrenching, film. When they were teenagers, one had both legs broken in an accident. During the long recuperation, the other did bedpan duty. Then, a few years ago, a doctor informed them that Linda had leukemia. Leora was devastated and then mystified – how could they be identical twins, with the exact same DNA, and yet be so divergent in a health matter? The ending is powerful and one of those rare glimpses inside the stunningly odd dynamic of twins – that powerful revelation of one uniqueness inside twin-dom.

Also airing this weekend

The Mentalist (Sunday, CBS, 9:30 p.m.) is back for its final 13-episode run. Did you miss it? Probably not. The show seemed to run out of steam at the end of the serial-killer Red John storyline. Now, it's about romance and work and mystery: The Sherlock-type Patrick Jane (Simon Baker) and his cop partner Teresa Lisbon (Robin Tunney), try to keep their new romance a secret and think about quitting law enforcement. Apparently they're even thinking about getting hitched. Yep, this is a cop show that will conclude forever with a spring wedding. Or maybe not. Both are annoying and annoy each other. Made for each other, though.

The Walking Dead (Sunday, AMC 9 p.m.) reaches is "mid-season finale." What will unfold at Grady Memorial Hospital where that crazy Dawn is in charge? As the show reaches this strange point – in a wobbly wayward season – you can only be sure that Rick Grimes is going to get mad. Real mad. Yes, sir. And somebody is going to be killed off. That will happen.