When Lou finds himself in trouble, Nick and Jacob fire up the hot tub time machine in an attempt to get back to the past. But they inadvertently land in the future with Adam Jr. Now they have to alter the future in order to save the past - which is really the present.
In future Britain, charismatic delinquent Alex DeLarge is jailed and volunteers for an experimental aversion therapy developed by the government in an effort to solve society's crime problem - but not all goes according to plan.
imon is a timid man, scratching out an isolated existence in an indifferent world. He is overlooked at work, scorned by his mother, and ignored by the woman of his dreams. He feels powerless to change any of these things. The arrival of a new co-worker, James, serves to upset the balance.
After developing an addiction to the substance he uses to kill bugs, an exterminator accidentally murders his wife and becomes involved in a secret government plot being orchestrated by giant bugs in a port town in North Africa.