THE Big Bang Theory may have wrapped last year, but spin-off series Young Sheldon is still going strong.
The prequel comedy, as the name would suggest, tracks the childhood of Sheldon Cooper (Ian Armitage), who is played by Jim Parsons on TBBT.
In the episode Pool Monster, Sheldon grapples with his anxiety about an upcoming swimming exam.
It’s not that he can’t swim, rather he’s disgusted by the amount of bacteria present in a public swimming pool.
In a nightmare sequence, Sheldon tries to reason with the pool, who communicates with him via a familiar-sounding disembodied voice.
Well it turns out the pool is voiced by none other than Kaley Cuoco, who played Penny in TBBT.
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“That was absolutely the voice of Kaley as pool water,” series co-creator Steve Molaro confirmed to TV Line.
“I needed someone to do the voice. I knew I wanted it to be female and kinda sexy, and I said, ‘Well, duh! Kaley is perfect for this.’”
Apparently Kaley immediately got on board with the idea, but didn’t want the casting to be announced before the episode aired.
“I said, ‘Hey, I have a weird pitch for you: Sheldon has a nightmare, and he has to go to this pool, and he speaks to the pool water. Do you want to be the voice of pool water?’” Molaro went on.
“She just laughed and said, ‘Absolutely, I do!’
“[Cuoco] wanted to hold it under wraps [as well], so that if you figured it out, that was a little Easter egg for you, so we were all on the same page about that,” he explained.
The news comes after Kaley opened up about the gruelling filming schedule of new TV show The Flight Attendant.
Taking to Instagram, she admitted she wasn’t used to working “around the clock” and gushed over the commitment of the production team.
The Big Bang Theory is available to stream on Netflix and Young Sheldon airs on E4.