Happiness is a Warm TV

What to Watch on Friday: Another airing of Glen Campbell doc

Glen Campbell … I’ll Be Me (9 p.m., Headline News) – If you missed this moving documentary Sunday on CNN, here’s another chance – don’t miss it this time! It tracks country superstar Glen Campbell as he begins a farewell tour after he is diagnosed with Alzheimer’s disease, and as he and his family navigate the unpredictable nature of the disease through love, laughter and music.

Also on tonight . . .

Defiance (8 p.m., Syfy) – Nolan and Irisa tour their past, and Amanda and Doc Yewll ask the Omec to help rescue them.

Biggest & Baddest (9 p.m., Nat Geo Wild) – In Uganda, Niall learns that villagers are causing the population of lions to decline.

Mysteries at the Monument (9 p.m., Travel) – In the Season 3 premiere, visits to a famous London church and to the palatial prison that once housed a famous first lady.

Catching Monsters (10 p.m., Discovery) – In the season finale, only a couple of giants remain in the final day of tuna season, and Jeff makes a last effort for the big money fish.

Dark Matter (10 p.m., Syfy) – When the crew has a stopover at a space station to restock and rest, the break takes an unexpected turn.