Final answer:
Helen Duncan reportedly channeled two 'ghosts' during her séances; a childlike spirit guide named Peggy and a more mature entity called Albert, who contributed to the theatrical aspect of the events.
Step-by-step explanation:
The question pertains to the historical figure Helen Duncan, who was a Scottish medium best known for her work as a spiritualist during World War II. During her séances, the two "ghosts" that reportedly appeared when Duncan was in a trance were her spirit guide, Peggy, who was described as a childlike figure, and a more mature and sometimes stern persona named Albert. These characters played crucial roles in the performances, interacting with attendees and allegedly conveying messages from the beyond. The description of these events is akin to a mix of religious service and entertainment, blending solemn spiritualism with the showmanship characteristic of variety performances of the time.