Mike asks Brick and Axl to help plan a surprise party for Frankie's 50th birthday; Sue posts a sign in the laundry room after losing a sock; coach Babbitt wants to turn Brick into an athlete.
When the body of an old man is found in an acid dump site, the team becomes enmeshed in retirement home drama. As they explore the case, talk of marriage and kids begins to dominate the conversation back at the lab.