Chuck E. Cheese's Pizza Time Theatre went into bankruptcy in 1984, before being bought by ShowBiz. After the acquisition, guest stars, alongside cabaret and lounge characters, would be retired to save costs. Since she was the last guest star produced, Helen Henny joined the Pizza Time Players as the permanent female vocalist.

Actually, Helen was the first guest star, debuting in August 1977 at the first PTT location (her showtape is sadly lost.) After a brief retirement, she returned in 1983, taking the place as the band's female vocalist.

While yes Helen was the first guest star, she would be the last new guest star produced in Cyberamic form before the bankruptcy and retirement of the guest star concept. Due to being the newest produced guest star, Helen became the permanent female vocalist for the band.

2 words: PTT's Bankruptcy.

RIP Harmony Howlette, Sally Sashay, Foxy Colleen, Madame Oink, and ik he wasn't a guest star but RIP crusty 🕊️🕊️

I think a certain event that caused a bankruptcy might have something to do with that.