: A two-part finale where Reese runs away to enlist after a heartbreak, and Hal faces potential jail time for his company’s legal troubles. Main Cast & Guest Stars Frankie Muniz Bryan Cranston Jane Kaczmarek Justin Berfield Erik Per Sullivan Christopher Masterson Notable Guest Cloris Leachman as Grandma Ida Notable Guest David Cassidy as Boone Vincent

Season 5 of Malcolm in the Middle , which originally aired from November 2003 to May 2004, is defined by the family's transition as the boys grow into their teenage years and adjust to the newest addition, baby Jamie.

: Directed by Bryan Cranston , this episode features Malcolm and Stevie needing the "unintelligent" Reese to help solve a complex scientific enzyme problem.

: Reese attempts to live on his own in an apartment and eventually makes a massive life change by enlisting in the Army during the season finale.

: Hal faces several bizarre crises, including being falsely accused of insider trading and joining a group of fathers who bet on their babies' developmental milestones. Key Episodes & Moments

: The family discovers their neighbors have been throwing a celebratory party every year specifically because the Wilkerson family is away on vacation.