Penny dreadfuls is a term used to describe cheap, sensational and thrilling novels in the 19th century. If you're looking for alternative terms or synonyms for penny dreadfuls, here are a few options: Shockers, Blood-and-Thunder stories, Horror tales, or Sensational novels. Another option might be Dime novels, which were similarly cheap and sensational stories sold primarily in the United States. If you want to be more specific, you could also use terms like Gothic romance, Mystery novels, or Adventure stories. Whatever term you choose, it's clear that these stories captured the imagination of readers in the 19th century and continue to be referenced today as a snapshot of popular culture at the time.