Thunderpussy lead vocalist Molly Sides found out the Showbox was slated to come down when she saw an article about it in the paper.

“I immediately was like, ‘F*** no. No, no,” she said.

The Seattle rock band, which put out its self-titled debut album earlier this year through Stardog Records/Republic Records, got its start at The Showbox and other iconic music venues in the city.

Sides said Thunderpussy reached out to the Showbox crew.

“And immediately I was like, ‘We will chain ourselves to the tree outside; we will not let go,’” Sides said.

Instead of limiting their mobility with trees and chains, Thunderpussy will put on a high-energy performance during yet another New Year’s Eve concert, billed as “Damn The Man Save The Showbox.”

Thunderpussy played the Showbox last New Year’s Eve, but Sides said the mood will be a little different than their Fire and Ice NYE Soiree, which featured dance numbers and the kinds of theatrical performances she loves. There’s going to be a little more rage in the mix.

“I mean, it’s a shared space, and being a part of it is amazing, and I can’t believe we’re doing it again,” Sides said. “It’s definitely going to be a different feel. We were in a different place last year.”

Thunderpussy started on the Seattle scene about five years ago, with Sides on vocals and Whitney Petty on guitar. Joining them were bassist Leah Julius and drummer Ruby Dunphy.

Thunderpussy announced its signing with a major label last fall, releasing their new single, “Speed Queen,” in early November.

They went into the studio with renowned producer Sylvia Massy, who has worked with the Red Hot Chili Peppers, Prince, System of a Down, Melissa Etheridge, REM and Tom Petty, to name a few.

“She’s amazing. Working with Sylvia’s a trip. It’s an experimental journey that I can’t wait to dive in and do again, because her brain, her brain is sexy,” Sides said. “She’s able to think really big and also push the button.”

Pearl Jam guitarist Mike McCready produced Thunderpussy’s first single, “Velvet Noose” through his Hockeytalker Records label. He shared the band’s record with Chris Cornell, of Sound Garden and Audioslave fame, who gave it his blessing prior to his death.

“That was like heart-wrenching and heartwarming at the same time,” Sides said. “For me, I’ve always been a huge admirer of Chris Cornell.”

Thunderpussy’s studio album by the same name dropped in late May.

News broke in July that Onni Group was planning to level the Showbox, 1426 First Ave., and redevelop the site for a 44-story apartment tower.

Thunderpussy wasn’t the only band to back efforts to stop the wrecking ball: Macklemore, Dugg McKagan of Guns n’ Roses, Death Cab for Cutie and Alice in Chains are among those putting their support toward efforts to preserve the performance venue.

The Seattle City Council provided temporary relief for nostalgic Seattleites when it voted in August to expand the Pike Place Market Historic District to include the 102-year-old Showbox building for 10 months.

While the city wanted to use that time to come up with a long-term plan to save the Showbox, it is now contending with a lawsuit filed by property owner Roger Forbes. Forbes claims the council engaged in spot zoning and violated his First Amendment rights by essentially requiring him to keep the performance venue open. He’s seeking damages to the tune of $40 million, which is what he expected to make with the real estate deal.

An August 2019 trial date has been set, but it’s unclear if the City of Seattle will settle with Forbes before then. If it does go to trial, and Forbes is successful, this year could be the Showbox’s last New Year’s Eve.

“The people that work with the Showbox, and have worked at the Showbox for so many years, are what really made that space,” Sides said.

She said New Year’s Eve is about supporting The Showbox and the people that make the venue something many Seattleites don’t want to let go.

“We’re trying out new things,” Sides said. “We’ll surprise ourselves, I’m sure, and hopefully everyone else.”

Sides said the Showbox is one of many examples of Seattle’s history being torn down and people being forced out as the city’s old neighborhoods continue to gentrify.

“It’s a much greater conversation than just one building that has such a historical, I mean, just such an aura.”

While Thunderpussy’s concert is centered around saving the Showbox, the band is still rocking in a new year, which, for the band, will include working on new music and touring.

“We are making new tunes. I mean, we’re kicking off the new year, so, yes, I don’t want to give it all away, but there will be some new tunes coming out real soon,” Sides said. “We’re always writing, but it’s at the point in which we can go into the studio and flesh things out.”

Joining Thunderpussy at the Showbox for New Year’s Eve is Portland-based band Red Fang, which will be joined by Thunderpussy in their hometown for a concert on Dec. 28.

“They are massive ragers and they put on a great show,” Sides said. “We played with them a few times; they are great guys.”

Tickets are priced at $39.50 online at showboxpresents.com, or $45 on the day of the show. “Damn The Man Save The Showbox” starts at 9 p.m. Monday, Dec. 31; doors open at 8.