Boyfriend from 27,000 B.C, Voyage to the Bottom of Buford

The boys go on an archaeological dig and find a real caveman, who falls in love with Candace. Meanwhile, Dr. Doofenshmirtz plans to destroy all people dressed as sandwiches
When Buford's goldfish goes missing, the boys help him find it out at sea. Meanwhile, Dr. Doofenshmirtz tries to destroy a tape of him 'saving' a kitten from a tree.