Nostradamus delivers a cryptic riddle on Family Fun Night. In 1805, Sacagawea helps Peabody and Sherman track down explorers Lewis and Clark.

Cleopatra, Mark Twain and other disgruntled guests stage a protest during the show's finale. Aristophanes's jokes flop when his comic muse flees.

Peabody and Sherman confront bizarro versions of themselves after entering an alternate reality that's ruled by a cyborg Mrs. Hughes.