NEW YORK–The decades melted away at City Center Wednesday night, as the astonishingly ageless Ellen Greene returned in all her glory to the role she made famous–the doomed, cutey-pie-voiced ingenue Audrey–in a smashing concert revival of “Little Shop of Horrors.”

Jake Gyllenhaal, demonstrating once again his surprising versatility, proved a thoroughly endearing squire for Greene, as uber-nebbish Seymour, the flower shop clerk who nurses a carnivorous flytrap to homicidal health. In point of fact, the whole darn cast–among them, Taran Killam, Joe Grifasi, Eddie Cooper and the girl group portrayed by Marva Hicks, Tracy Nicole Chapman and Ramona Keller–made a highly electric evening out of this mock-schlock-horror story, with a juicy score by Howard Ashman and Alan Menken.

It’s hard to bottle the effervescence uncorked for this kind of casually-staged production, directed with aptly witty touches by Dick Scanlan as part of the Encores! Off-Center program. Its magic isn’t built to linger; it only runs for three performances, ending Thursday night. But if the 64-year-old (!) Greene is approaching the part she first played off-Broadway in 1982 with anything but 1,000-percent commitment, it is impossible to detect. Her Audrey is now an even more touchingly fragile creature. The portrayal, consisting of equal parts faint-hearted damsel and woman of poignant desire, now comes close to being a fiercely comic antidote to Blanche DuBois.

The versions she delivers of some of Ashman and Menken’s best songs–her solo “Somewhere That’s Green” and the duet with Gyllenhaal, “Suddenly, Seymour”–shimmer with a degree of subtle comedic artistry not in evidence in her performance in the campier 1986 movie version that also starred Rick Moranis and Steve Martin. Gyllenhaal reveals on this occasion considerable comic chops of his own as well as authentic vocal skill; with this and his terrific performance last winter in Broadway’s “Constellations,” he has earned what few Hollywood stars of his generation can claim: an invitation from discerning spectators to an ongoing stage career.

For Audrey II, the plant on a human meal plan, Cooper adopts an irresistible majestic ferocity, and Saturday Night Live’s Killam applies a gleefully smarmy veneer to Orrin, the dentist with an advanced degree in pain enhancement. In the end, you feel as if all boats rise here to the consummate level of Greene, who shows an audience in 2015 why in 33 years and umpteen revivals of this buoyant little show, she’s never been matched.

Little Shop of Horrors, directed by Dick Scanlan. Music direction, Chris Fenwick; choreography, Patricia Wilcox. At New York City Center, 131 W. 55th St., New York. Remaining performances sold out.