"The wolf thought to himself, what a tender young creature. What a nice plump mouthful..." - Little Red Riding Hood
The original Grimm tale follows Little Red Riding Hood, who walks through the woods to deliver food to her sick grandmother. On her journey, a friendly wolf approaches Little Red Riding Hood and suggests the girl pick some flowers for her grandmother.
In the meantime, the wolf goes to the grandmother's house and gains entry by pretending to be the girl. He swallows the grandmother whole and waits for the girl, disguised as the grandmother. When the girl arrives, she notices that her grandmother looks different. This eventually culminates with Little Red Riding Hood saying, "My, what big teeth you have!" to which the wolf replies, "The better to eat you with" and swallows her whole as well.
A hunter, however, comes to the rescue and cuts the wolf open. Little Red Riding Hood and her grandmother emerge unharmed. They then fill the wolf's body with heavy stones. When the wolf wakes, he attempts to run away, but the stones are so heavy that he collapses at once and falls dead.
The Grimm tale also features a second part, in which the girl and her grandmother trap and kill another wolf, this time anticipating his moves based on their experience with the previous one. The girl does not leave the path when the wolf speaks to her; her grandmother locks the door to keep the wolf out; and when the wolf lurks, the grandmother has Little Red Riding Hood put a trough under the chimney and fill it with water that sausages have been cooked in. The smell lures the wolf down, and he drowns.
While the premiere episode of "Grimm" does not follow the tale of Little Red Riding Hood directly, it does introduce Blutbaden, wolf-like creatures that are attracted to the color red. We notice a pattern of girls wearing red hoodies being snatched from the forest and learn that the creature responsible for this is a Blutbad. While the Blutbad does intend to eat the young girl, he first seeks to fatten her up and hold her hostage, which deviates from the original tale of Little Red Riding Hood.