Todd Giebenhain

Lois enlists Malcolm to tutor Reese.

Lois forces Malcolm to befriend the meanest old lady on the block; Dewey begins carrying a purse to school.

Leonard is pleasantly surprised when his mother, Beverly, comes to visit and she’s genuinely kind toward him – until he finds out the real reason why she’s there; Meanwhile, Denise and Stuart overstay their welcome at the Wolowitz house.

On Monday morning, Malcolm (Frankie Muniz) and his brothers convince their ailing mother (Jane Kaczmarek) that it's Sunday.

Hal, Malcolm and Reese wander into a desert artillery range after being banned from a casino for counting cards.

The team dives back into investigating a serial killer from the past, attempting to find “The Puppeteer,” who lives with his victims’ bodies before disposing of them. Meanwhile, Brennan works through her guilt over her retirement last year, blaming herself for not stopping the serial killer earlier. However, little does she know she might be in some trouble of her own.