Jennifer Garner Lands Role in New HBO Show from Lena Dunham The former star of Alias gets the role in Camping, which has landed an eight-episode order from HBO. Garner, 45, plays a character named Kathryn Siddell-Bauers in the series, which centers around a couples camping trip and all that goes wrong with it. “a controlling LA mom who is far less cheerful than her Lululemons imply. Kathryn controls the proceedings with an iron grip until she’s faced with a woman who undoes all her best-laid plans.” Dunham and co-writer Jenni Konner previously worked together on their HBO comedy “Girls,” which ended in 2017. Garner was nominated for four Emmys and won a Golden Globe for her role as CIA agent Sydney Bristow on “Alias."