Ms. Trekker was an unhappy customer in Mopatop's Shop episode "No Sea". She had bought a do it yourself mountain kit, but the box had no mountain in it only the sea. Luckily for her earlier in the day Mr. Holiday had come in to complain about his do it yourself beach kit that was missing the sea and had a mountain. So the two of them traded the sea and mountain and decided to help out putting the kits together.

The puppet was originally used as Murray on Fraggle Rock, and used in various roles on Mopatop's Shop.