Gretchen is a clerk from Rite Aid who calls a shirtless Peter "gross" in "Undergrounded".

When the guys need rescued from a tunnel that Peter dug to escape Lois and being grounded, they find that Peter is too big to fit through the hole without taking off his shirt. He asks that if Rebecca is present from Rite Aid, that they have her turn around. But when they pull Peter from the hole, he finds it's Gretchen and not Rebecca.

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