Kicked out of their dam when their parents have another litter, Norb and Dag strike out on their own. Their search for a new place to live turns into a right struggle because Daggett rejects what their parents taught them and wants to build a new home HIS way.

Now living on their own and away from parental control Norb and Dag realise they can stay up all night if they want. What starts out as a wild good time quickly turns into a journey into the madness of sleep depravation...

Seeking to exploit the beaver's natural instinct to build dams when they hear running water, the government parachutes Norb and Dag into a flood zone. Soon the brothers find themselves facing a river with a mind of its own and no intention of backing down...

Beavers' teeth never stop growing and letting them grow long becomes the latest dangerous fashion fad . The boys soon discover there's a price to pay when you live in the fast lane of high fashion...

Like most of us, Norb and Dag love cool breakfast cereal free gifts. But when Daggett's arduous quest to save 1,000 boxtops to get the ultimate boxtop toy is frustrated, the boys mail themselves to the cereal company to collect their prize.

Daggett is blackmailed by the government into becoming Muscular Beaver once more in order to fight a hundred-foot-tall rampaging splinter. Norb is forced to come along as Muscular Beaver's new sidekick. Hilarity ensues.

The Beavers squabble over who is best friends with Stump (their tree stump friend) and Norb reveals hurtfully that Stump was "transplanted." When a confused Stump goes off in search of his natural family, the boys follow after him with comedic results.

While on their way to a local sports coliseum, Daggett annoys the bus driver who accidentally drives the bus through "a hole in the fabric of space and time." The boys end up at the real Roman Colosseum, where Daggett picks so many fights both beavers are forced to become gladiators. After surviving man-eating lions and the dreaded Two-Eyed Cyclops, the Beavers lead Caesar's army on a madcap chase that topples Rome.

Daggett and Norbert learn how to mark territory with their scent glands. Their fraternal jealousy kicks off a marathon of territory claiming across the dam, the forest, and the entire country. The boys finally learn their lesson at the hands of some rather smelly lumberjacks.

Daggett and Norbert vie for their baby sisters' affection when the two girls are left in their care for the weekend. While self-proclaimed child care expert Dag maps out a detailed itinerary of ""fun"" stuff to do, Norb kicks back and lets them do what they want. Neither plan works, and pandemonium reigns.

Daggett decides to be Big Rabbit's friend since he is feared, and attempts to use him as his personal body guard. All is well until Big Rabbit wants to cash in on the friendship promise and turns Dag into a "beaver football."

Daggett and Norbert are in a cave with Stump for some harmless "spaylunking." Dag gets hungry and his growling stomach causes the tunnel to cave in, blocking the exit. Trapped inside the mine with no exit and no food, Daggett tries to eat Stump.

Daggett gets taken in by EC comics books' "The Konspiracy Komiks Presents: The Attack of the Howler Leeches" and sends away for the Konspiracy Kevin head doll. When Dag pulls the string, the head warns him that all animals will be attacked by the Alien Howler Leeches. He panics while Norbert thinks he's been scammed. Dag persists in his paranoia, so Norb recruits Big Rabbit, Barry the Bear, and Truckie to justify his fears.

Norbert and Daggett pick up where they left off from their first "Up All Night" adventure to find that they have been up so long that they are years into the future. When they attempt to go to sleep, they discover that they're too tired to sleep and the mayhem begins all over again.

The Beavers have their own Y2K incident, when Dag's super sour punch shocks them into a brave, new fantasy world where the rules are theirs to create. True to their sibling rivalry, the boys soon make a mess of it.