Elizabeth Montgomery appears in the dual role of Samantha Stephens and Sam's lookalike cousin, Serena. When the footloose and fancy-free Serena is arrested at a hippie love-in, her picture is splashed all over the front page, and everyone assumes that it was Sam who ended up in the slammer. Intending to apologize, Serena is miffed by Darrin's attitude and vows to make things worse by causing a ruckus at Darrin's office. Star Montgomery sings a swinging version of "Rock-a-Bye Baby" and a newly minted song, "Iffn." Written by Michael Morris, "Hippie, Hippie, Hooray" was first telecast on February 1, 1968, an occasion that somehow warranted a cover story in TV Guide. Curiously, the syndicated version of this episode contains no laugh track, leaving long and sometimes uncomfortable "reaction" pauses in the dialogue. ~ Hal Erickson, Rovi