Maleen was an owner of a store on Earth near where Penny Robinson and Will Robinson attended a school. When Penny traveled to the past and stole candy from her store, she saw the theft on her cameras and reported it. This set off a paradox that caused Penny to not be assigned to the 24th Mission. When Will traveled back in time to correct this error, he found Penny at Maleen's shop, but was pleased to see that Maleen was not at the counter. He knew that Penny planned to take the candy thinking that Maleen was in the back room and would never notice. As he talked with her about it, Maleen returned and he asked them if they needed any help. Penny told him that they were good and pulled Will away. They discussed the matter further and as they left, she waved goodbye to Maleen, telling him to forget they were ever there. He just looked at them with a confused expression.
Behind the scenes[]
Maleen is only mentioned in Lost in Space: Return to Yesterday, a novel based on Netflix's Lost in Space.