Big Bang Theory Star Breaks Down Godzilla-Style Return In Stuart Fails To Save The Universe Episode 3: 'My Goal Height Has Always Been 5 Feet'

Bernadette Rostenkowski gets a larger-than-life showcase in "Stuart Fails to Save the Universe" Episode 3 — and no one was more delighted by the outsized turn than the sorceress herself, 4'10½" Melissa Rauch.

When the "Big Bang Theory" alum first read the script for her top-secret guest role — she's the third legacy cast member to return in as many episodes, following Kunal Nayyar in Episode 1, and Kaley Cuoco in Episode 2 — she figured the giant Bernadette sequence would mostly be the work of visual effects. Instead, she learned she'd be donning a motion-capture suit and stomping through a miniature Pasadena.

"When they told me it was going to be an 80-foot-tall Bernadette... my goal height has always been five feet," Rauch tells TVLine with a laugh. "So to get 75 extra feet to play with was thrilling."

So, how exactly does Magic Realm Bernie go from ostracized member of the Wizards Guild of America to ravaging Southern California? It all begins when Stuart and Kripke ask Alexa (played by "Mike & Molly" alum Louis Mustillo) for help tracking down a sorceress capable of fixing the quantum interference device. That leads them to Bernadette, who ultimately agrees to help them... in exchange for a cup (or possibly a pint) of Stuart's blood.

But as WGA leader Wil Wheaton warns Stuart, Bernadette is a literal demon, and giving her what she wants has catastrophic consequences. Before long, she's tearing through the streets of Pasadena, determined to seize the device that allows Stuart & Co. to travel between worlds.

For Rauch, the highlight wasn't simply towering over the miniature city. It was getting to play in it.

"To pick up a tiny building was the greatest rush," she says. "They had a Barbie for me to pick up, and then I had to open up the roof and talk to miniature versions of the cast. It was just so cool. I've never done anything like that, and it was really thrilling."

Her enthusiasm clearly didn't go unnoticed. As series co-creators Chuck Lorre, Bill Prady and Zak Penn tell TVLine in our Episode 3 breakdown (embedded above), Rauch kept asking to do additional motion-capture takes, even after the creative team had everything they needed.

"Melissa was over the moon," Lorre recalled. Penn added that Rauch "kept wanting to do more takes in the mo-cap because they built a replica of the city that she could stomp through," while Prady remembered her insisting, "I want to stomp through the city more!"

The experience proved so satisfying, Rauch jokes, that it came with one unexpected side effect: "The only downside is the fact that now I'm on such a rush from it that I just want to crush buildings in my mind. It's very fun, quite a high."

Giant Bernadette isn't merely a visual gag. For Rauch, the sequence represents the ultimate extension of one of the character's defining traits: the contrast between Bernadette's diminutive stature and her intimidating side.

"One of the things that I loved most about playing Bernadette were those moments where I got to come out with some bite, or look at someone sideways, or say something that terrifies someone," she says. "So to actually be the physical embodiment of that was really cool. Never in my wildest dreams would I have ever thought I would get to do that."

As Kevin Sussman observes in TVLine's Episode 3 breakdown, that's precisely why Giant Bernadette works.

"There were trace amounts of angry [back on 'Big Bang']," he recalls, prompting Lauren Lapkus to agree: "Yeah, she had an edge."

As for slipping back into Bernadette's high-pitched register, that took a bit more preparation on Rauch's part — but nothing she wasn't already used to doing. She tells TVLine that she called her mother, whose voice famously inspired Bernadette's, on the drive to set, just as she always had years ago. She also watched a clip from the original sitcom to make sure she was "still in the right pocket" before arriving.

"I'm so grateful for Bernadette's voice because voice has always been my way into characters," Rauch says. "So the minute that I was able to start speaking like her, it just felt like putting on a comfy old robe. It's like, okay, I know who she is because I'm able to get into that higher register."

Also helping matters was the fact that her first scene was opposite Sussman and John Ross Bowie: "Opening the door in that first moment to their faces just was so wonderful... It just felt like old times."

Even after speaking with Lorre, Prady and Penn beforehand, Rauch says nothing prepared her for the sheer scale of the production.

"They're shooting features every single episode on this enormous scale," she explains. "I was just so blown away by everything they were doing and the detail, and just the magnitude and the magnificence of it all."

That attention to detail extended well beyond the visual effects. Rauch says every department poured extraordinary care into Sorceress Bernadette's home, from the set decoration to the props to recreating Bernadette's signature glasses after Rauch provided the exact make and model she'd jotted down years earlier. But more than anything, stepping onto the "Stuart" set reminded her of the excitement she felt when she was first cast on "Big Bang" in Season 3.

"When I joined 'Big Bang Theory,' I had been a fan of the show," she says. "I remember walking onto the set for the first time and sitting on the couch with the characters for the first time, all those years ago. This was reminiscent of that because, even though I hadn't seen the show, I was walking into this world that they had built, based on a world that I love so deeply. I was definitely there fangirling, being on set with everyone, seeing what they were creating and getting to be a part of it."

Coincidentally, Rauch and Wheaton both made their "Big Bang Theory" debuts in Season 3, Episode 5, "The Creepy Candy Coating Corollary." Seventeen years later, they also make their first "Stuart Fails to Save the Universe" appearances in the same episode — though, like the first go-round, they never cross paths.

By the time Giant Bernadette begins her tour of terror, Bert has already defeated Wheaton in a supernatural battle.

According to Brian Posehn, one of the duel's funniest visual gags wasn't in the script. While filming, he and Wheaton instinctively began countering each other's spells with devil horns and "Star Trek"-inspired Vulcan salutes.

"We realized we were both doing it and we laughed," Posehn tells TVLine. Director/executive producer Kyle Newacheck spotted the bit and encouraged the actors to lean into it. "Anytime you get an improv through as an actor, it's already a cherry on the top of the fun day that you're already having."

Episode 3 also offers a fun update on Magic Realm Sheldon Cooper, who, according to Magic Realm Alexa, is currently starring in a revival of "Man of La Mancha."

So, does that mean Sheldon traded theoretical physics for a career on the stage — not unlike Jim Parsons himself, who is currently starring on Broadway in "Titanique"?

"In that universe," Prady confirms to TVLine. Penn notes that the career change makes perfect sense within the rules of the magical world — "He couldn't have been a scientist" — while Lorre sums it up even more succinctly: "He's a Broadway star!"