Hi, I hope someone can help me identify something I watched as a kid. None of the things I can remember may be reliable. It may have been from the 70s or 80s. The little I can remember is, a man goes to a mansion to do some type of work for a woman. I don't think he was a workman, maybe a writer...detective...scientist I don't know, but at the end the man sees a monster/alien child emerge from a dimensional portal and the monster kid keeps saying mama mama mama. It may have been from a horror anthology TV show or movie. Hope someone knows what it is.