Tod Lubitch is born with a deficient immune system. As such, he must spend the rest of his life in a completely sterile environment. His room is completely hermetically sealed against bacteria and virus, his food is specially prepared, and his only human contact comes in the form of gloved hands. The movie follows his life into a teenager.

When widower Mike Brady marries a lovely lady widow Carol Ann, their two families become one. These are the misadventures of this new couple, their six children, a dog named Tiger, and quirky housekeeper Alice.

Almost 20 years after the start of the original “Brady Bunch” the kids are grown up and have kids of their own. Everyone is having a wonderful time back at the family house for Christmas, until Mike learns of a structural problem in one of the buildings he designed. As he is inspecting the problem, the building collapses, trapping him inside. As the whole family waits by the pile of rubble, they fear the worst. Will Dad be all right?