Questions regarding the identity of an actor in a science fiction movie or show.

Identifying an actor is from Sci-Fi or Fantasy media, be it film, movie, TV or otherwise, because sometimes we just can't put a name to the face, and IMDB doesn't always list them in the credits (especially with cameos). Who was it in that creature suit? Is this the same guy that played the baby in Psycho Baby Alien Death March 4: Return of Psycho Baby?