Malcolm tries to keep Dewey from scoring high on an IQ test so he doesn't end up with the Krelboyne's, but scheme backfires and Dewey is diagnosed as mentally disturbed.

Lois drives to Canada to meet with her sister, Roberta, and her family; Ida vows to spend all her money to get Victor's pension; and a temporarily blinded Hal participates in a 5K race with Dewey.