In the fifth season of Seventh Heaven Mary's (Jessica Biel) decides to put college on hold for the time being and work instead, but things get tricky when she suddenly purchases a lavish sports car and ignores the monthly payment bills, plus Lucy (Beverley Mitchell) starts off her senior year with a Homecoming Queen nomination and a relationship with a formerly suicidal young man in "Help." High school freshman Simon struggles to fit into his new surroundings in "Gossip," and fifth grader Ruthie becomes the first in her family to gain admittance to an elite private school but she has some trouble in "Crazy." Meanwhile, Lucy, now 16, has become so serious about Jeremy (David Lago) that she ends up proposing to him in "Chances Part 1." Also included in this season is the show's landmark 100th episode, "One Hundred," which chronicles Eric's birthday celebration and includes some special surprises for the birthday boy from his cherished daughters. This season's special guest stars include child star prodigies Mary-Kate and Ashley Olsen in "Gossip."