When younger brother Ferguson displays her training bra in show and tell, Clarissa hatches a plan to send Ferg-face into outer space via helium balloons and a straight jacket.

Clarissa and Sam go to a party dressed as cool, hip, outrageous characters. Clarissa dons a wig, a tatoo, and a nose ring and decides to call herself Jade. At the party, she falls for a cute guy named Paulie. But Clarissa isn't sure if he's interested in her or the ficticious Jade. Meanwhile, Ferguson finds a stray cat who he names William F. Buckley and tries to hinder his parents from looking for the real owner.

Clarissa discovers that real science can be really weird. After interviewing a woman who supposedly spotted a UFO, Clarissa decides to get to the bottom of the UFO phenomena herself.