Weird Science Season 3 Episode 3 : Grampira

Wyatt visits his Grandma in a nursing home and is saddened that she isn't the same old Nana that she used to be. He asks Lisa to give Nana the spirit of a young person, which Lisa does. Nana becomes more spirited, but the new energy is coming from other people- she's sucking the youth out of everyone that she meets. Gary and Wyatt turn into old teens and have to find Nana and return her to the nursing home before they die of old age.