M2, T9: With 67 cents worth of backing from Chris and Tracy, plus his own savings, Danny's newest investment is hamsters. Shirley reluctantly agrees, seeing the hamsters as a good experience in responsibility for Chris, Tracy, and Danny. In a matter of weeks the house is full of hamsters. Danny, of course, is overjoyed at the prosperous results of his investment. When the family departs for a tour, no one can be found to "hamster sit," so they are packed into the bus. After a series of mishaps - due entirely to Danny's "investment" - Shirley decides the hamsters must go. She finally convinces the kids that it's not fair to the hamsters, as it is impossible to love that many pets. They see the wisdom in her decision and Danny (with Shirley's help) tries to find homes for the constantly growing number of hamsters. Much to Shirley's dismay no one wants to relieve the Partridge family of their private population explosion. Finally, Danny comes up with a great idea - a free hamster with every purchase of a Partridge Family Album! The family spends an afternoon at the neighborhood department store handing out hamsters, and the problem is solved.