Justin Moran may not have much power on Broadway, but that hasn’t discouraged him from taking on the formidable responsibility of ensuring that New York has at least one Spider-Man musical that officially opens by mid-March.

Frustrated by the web of delays engulfing “Spider-Man: Turn Off the Dark,” the $65 million Broadway spectacle that is now to open on March 15 (if not later), Mr. Moran, an improv comedian and a composer, has decided to beat Julie Taymor and her team to the punch by opening his own show about that comic-book wall-crawler one day earlier, on March 14.

“Our goal isn’t to tear down Julie Taymor or parody her production,” Mr. Moran said in a telephone interview on Tuesday morning. “Our goal is to do what she should have done in the first place, and that’s just make a really good musical.”

Mr. Moran said the inspiration for his musical, “The Spidey Project: With Great Power Comes Great Responsibility,” which is to make its debut on March 14 at the Peoples Improv Theater in Manhattan, came to him after reading the many scathing reviews of “Spider-Man: Turn Off the Dark” that were published after Feb. 7, a missed opening date for the Broadway production.

After hearing about the troubled history of that show and reading reviews suggesting that it was not particularly faithful to its comic-book source material, Mr. Moran felt confident he could do better.

“I was like, of course it’s going to fail,” said Mr. Moran, whose lyrics for “Pope! The Musical” won an excellence award at the 2010 Fringe Festival. “They’re doing it all wrong. They’re spending all this money on all the wrong things.”

Around 2 a.m. on Feb. 11, Mr. Moran posted the first in a series of YouTube videos he calls the “Spiderman Smackdown,” announcing that he was creating his own musical — with a budget of exactly zero dollars. By 10 or 11 that morning, Mr. Moran said he was already getting e-mails from prospective cast members, composers, costume and set designers, and other crew members volunteering to participate.

Mr. Moran said his “Spidey Project,” which has a book written by him and Jon Roufaeal and a score composed by Adam Podd and Doug Katsaros, will “100 percent” follow the origin story laid out for Spider-Man in Marvel Comics: “It’s Peter Parker, in high school at Forest Hills when he gets bitten by the spider and all that good stuff.” He acknowledged that he did not have formal permission from Marvel to pursue this project, but he said that he was given volunteer legal advice that “there’s enough leeway in the parody or spoof angle” to proceed.

Depending on the reception that greets the opening of his “Spidey Project” (and whether or not he can get his cast and crew to donate additional time) Mr. Moran said there might be more than one performance of the show, but it was unlikely to threaten its Broadway rival over the long haul.

“If I can manage to get one performance off without getting any cease-and-desist letters,” Mr. Moran said, “maybe I’ll count my blessings.”