Entertainment Weekly announced today that Annabeth Gish has been cast in the role of Ben's (Adam Scott) sister, Stephanie in Parks and Recreation.
The episode, which airs later this year, will film next week. The plot involves Ben and Leslie (Amy Poehler) taking a roadtrip to his hometown during homecoming week.
Annabeth Gish, who has recently appeared on Once Upon a Time and Pretty Little Liars, also co-stars in the FX pilot The Bridge.
Source - Entertainment Weekly