Werewolf of London (1935)

In the horror flick Werewolf of London (1935), directed by Stuart Walker, Henry Hull takes on the role of the titular werewolf. The story follows Wilfred Glendon, a wealthy and renowned English botanist who sets off to Tibet in search of an elusive plant known as Mariphasa lupina lumina. This plant is said to only bloom under the light of the moon. While in Tibet, Glendon is attacked and bitten by a wild humanoid creature but manages to obtain a specimen of the rare plant. Back in his London laboratory, he creates a lamp that mimics moonlight in hopes of seeing the Mariphasa bloom. At a social gathering, Glendon is approached by Dr. Yogami, another botanist who claims they briefly crossed paths in Tibet while both searching for the same plant.

Yogami reveals that Mariphasa is a temporary remedy for ‘werewolfery’ or ‘lycanthrophobia’. He even goes as far as to mention two men in London who have been turned into werewolves after being bitten by one themselves when confronted with Glendon’s doubts. After some time, a Mariphasa flower blooms in the glow of Wilfred’s moon lamp. When his hand begins to sprout fur under the artificial moonlight, he plucks the blossom and uses its sap to reverse the transformation. Yogami pays a visit and requests two flowers, as it is the first of four nights when untreated werewolves will turn during the full moon. However, Wilfred declines. Before leaving, Yogami warns that werewolves often harm those they hold dearest.