Although it has the look and feel of a normal episode of the MONSTERS TV show - rubbery costumes and all - GLIM-GLIM is something else besides. In fact, it's superlative stuff; an incredibly moving story, told simply and benefiting from an absolutely fabulous twist ending which will sucker-punch any viewer.
In fact, GLIM-GLIM is one of the saddest things I've ever seen. It's up there with GRAVE OF THE FIREFLIES levels of sad. The story involves an alien ambassador who comes to Earth and befriends a young girl, but tension develops when the girl's father becomes aware of his daughter's new friend. What plays out is simple but unexpectedly effective, and thoroughly moving. It's undoubtedly the best episode of MONSTERS out there.