Granny Gargoli's (Stella Stevens) money grubbing family can't wait for her to die. The animosity is mutual. The only "good family member" is granddaughter Kelly (Shannon Whirry). Granny's trying to locate an elixir to keep herself from dying, and The Potion Man arrives with the desired chemicals and a warning – he can deliver immortality, but she'll have to follow the rules: no exposure to direct sunlight, and you've got to make peace with the family before ingesting it, "or the results will be disastrous."
When the family poisons Granny to hasten her death, she gulps the elixir without the necessary preparations; naturally she returns as a member of The Undead – but suddenly she's assumed the voice of Freddy Kruger, along with his one-liners. She murders the family in an array of amusingly gory methods, with the exception of Kelly and youngest kid, Amy. Kelly finds the hideously mutilated family having dinner – now that they're dead, they've all become Shacky Green. There's even a nod to one of the Texas Chainsaw Massacre film, when Granny's long-dead skeleton of a husband joins the gang.
The intentional clichéd touches are endearing; the melodramatic music, the overexaggerated acting, the gratuitous nudity, the trite dialogue. 80's "bad comedy as horror" aside, this is one to add to your collection if you're a connoisseur of trash. This genre is often described as "cheesy"; The Granny is a slab of perfectly runny Brie.