The Shell (S07E02)

Cassie, Abigail, and Joy delve into the history behind the mysterious soil pouches, but their investigation only raises more questions. Meanwhile, Cassie and Sam's double date with Grant, the hospital administrator, and his girlfriend, Monica, takes an unexpected turn. In a nostalgic twist, the entire town of Middleton is transported back to the 1950s when Martha sets up a "Grease" themed movie night in the park, culminating in an unexpected romantic surprise.