Most of the original cast will be back, and in a neat connection, Will Roland, who originated the role of the acerbic Jared in “Dear Evan Hansen,” will take on Jeremy in “Be More Chill” during the summer run, slated for nine weeks.
It’s hard to tell what ignited the frenzy, but about a year and a half after “Be More Chill” closed, the sci-fi-tinged story of the teenage dork and his friends somehow started getting traction.
Newbies would discover videos in the “recommended” column on YouTube, usually after they’d clicked on “Hamilton” or “Dear Evan Hansen” videos, and the internet helped link fans all over the world.
“I was getting tagged in fan art, then I started noticing people were writing fan fiction about my character and Jeremy,” Mr. Salazar said by telephone. “I was dumbfounded by all of it.”
Nowadays, even a show with a short run outside New York can get a cast album that may go viral. “For shows that don’t have productions, it’s a very easy way to get to a wide audience,” said the producer Ken Davenport, whose “Once on This Island” is now on Broadway. “And then the licensing companies respond.”
Indeed, Rodgers and Hammerstein picked up “Be More Chill” in July 2017 and made it available as a licensed show to schools and amateur companies.
The fan phenomenon was picking up velocity. The recording entered the Billboard Cast Album chart’s Top 10 a whopping 97 weeks after its release, by Ghostlight.
Illustrations and stories connected to the show spread on Tumblr, where “Be More Chill” inspired the second biggest musical-theater fandom of 2017, just behind the following for “Hamilton.”
Animated storyboards known as animatics popped up on YouTube; the most frequently rendered is the tour-de-force song in which Mr. Salazar’s character has an anxiety attack.
“Right after I discovered ‘Michael in the Bathroom,’ I decided to try drawing an animatic for it, even though I still didn’t know what the musical was about,” Claudia Cacace, a 22-year-old who lives near Naples, Italy, said by email. “I just related to the character so much that I felt the need to draw the scene.”
In turn, Dove Calderwood, 27, discovered Ms. Cacace’s art and commissioned her to animate the entire musical.
“It was something I wanted, and it was something I knew the fans wanted, because we didn’t have any visuals for the show,” Ms. Calderwood said by telephone from her home in Idaho Falls, Idaho.
Another popular take on “Michael in the Bathroom” is an inspired cosplay performance (that is, lip-synced in character and in costume) by a 20-year-old who goes by “Jack or Aless, depending on the situation” and hails from Toronto.
“Everyone I’ve ever talked to about this musical has told me that they’ve been in the situation Michael was in,” Jack said in an email. “Being in such a vulnerable moment in your life, and then listening to a song that has a character that knows what it’s like to go through it, it really does make you feel that you’re not alone in this.”
Still, she made sure to seek out Mr. Salazar during a meet-and- greet after the 54 Below concert that went on longer than the show itself. She had brought him a Pac-Man toy because his “Be More Chill” character has a Pac-Man tattoo. (The show, “Two-Player Game,” has a few more performances through the end of May.)
There is no denying that fans are committed. They turned up in droves for an amateur production of “Be More Chill” in November at New Jersey’s Exit 82 Theater.
“It was the most insane attention any of my shows has ever received,” said Mr. Iconis, still sounding slightly stunned. “We needed security for a talkback at a community theater. Security!”