Radio psychologist Jack Black takes his children Joshua and Ashley on a 'vacation' to a lake in British Columbia. While he grinds away at work the children discover that the famous local lake monster "Orky" may not be just a gimmick to attract tourists after all. In fact, Orky may enable them to get closer to their workaholic dad, and help stop local polluters who are dumping toxic waste.

Tom McHugh quickly learns that his perfect big brother Craig isn't all he's cracked up to be while on a night on the town with the girl next door, during which Tom is harassed by unpleasant strangers, threatened by mobsters, pursued by police, attacked by an irate florist, accused of murder, and has his date kidnapped—all because everyone thinks he's Craig...and the classic 1959 DeSoto Firesweep he borrowed off his brother has two dead bodies in the trunk.

While other kids buy into countless hours of studying just so they can get a mark in some teacher's report book, Handsome Davis sees it as nothing more than a system of control over your mind. That's why Handsome and his three best friends Sammy, Victor and the cribsheet genius Applebee have banded together and found ways to cheat on their tests all through their school years.

In 1970s New York, Martin (Maguire) hopes to locate his father and possibly reunite the parents who have been bitterly separated since he was born.

Mollie and James are together and raising a family, which now consists of an older Mikey and his baby sister, Julie. Tension between the siblings arises, and as well with Mollie and James when Mollie's brother Stuart moves in. Mikey is also learning how to use the toilet for the first time.