Peter Jenkins was a Man of Letters.
Along with James Haggerty, he powered up the Men of Letters bunker sometime in the past. Also with Haggerty, he was one of two men of letters who Dorothy sought assistance from. However, during their meeting, the Wicked Witch escaped and placed Peter Jenkins under her control. Dorothy, followed by the Wicked Witch, ran up to the lab while Peter attacked James. In the ensuing fight with James Haggerty, Peter was stabbed by his own knife. This freed him from the influence of the Wicked Witch but it also cost his life.