SPOILER ALERT: This story contains spoilers from Season 5, Volume 1 of “ Stranger Things .”

Not even on the fantastical “Stranger Things” can Karen Wheeler kill a Demogorgon while armed only with her super-charged maternal protectiveness and a broken wine bottle. But she sure did try.

Karen — the perpetually bewildered, out-of-the-loop mom of Mike, Nancy and Holly Wheeler, played since Season 1 by Cara Buono — finally is clued into the existence of Hawkins’ deadly other dimension when no less than a Demogorgon enters her home, hellbent (literally) on stealing her youngest child, Holly (Nell Fisher). Though she’s been drinking all night, and is intent on taking a nice, relaxing bath, Karen snaps into focus, desperate to save Holly. As the ABBA song “Fernando” plays, Karen holds

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