This is a summary. To read the whole story subscribe to BostonGlobe.com
When last seen, Michael Cera was impaled on a lamppost like a hunk of wriggling bait in “This Is the End.” In his new film he wanders the desert hugging a giant, phallic, hallucinogenic cactus. In short, he has transformed himself from one of the most irritating actors of his generation to one of the best. And a good part of the credit goes to Chilean director Sebastián Silva and his “Crystal Fairy,” a wry, sad, latter-day “Easy Rider” (1969).
Cera plays an obnoxious, naive American who has traveled to Chile in search of cheap thrills, specifically a taste of the magic cactus that he hopes will blow his mind. He enlists three friends (played by Silva’s brothers) to help him on his quest.