The band name, chosen by Bob Mosley and Spence, came from the punch line of the joke "What's big and purple and lives in the ocean?". Lead guitarist Jerry Miller and drummer Don Stevenson (both formerly of The Frantics, originally based in Seattle) joined guitarist (and son of actress Loretta Young) Peter Lewis (of The Cornells), bassist Bob Mosley (of The Misfits, based in San Diego), and Spence, now on guitar instead of drums. Jerry Miller and Don Stevenson had moved The Frantics from Seattle to San Francisco after a 1965 meeting with Jerry Garcia, then playing with The Warlocks at a bar in Belmont, California. Garcia encouraged them to move to San Francisco. Once The Frantics were settled in San Francisco, Mosley joined the band.