Professor Gaster was one of the Lead Scientists at The Dreemurr Company, who was Sans’ and Papyrus’ father who had created them using his DNA and small pieces of his own Soul. “Oh, hello there. Did you perhaps… Need something?” Gaster asked you in a soft voice. “I am WingDing Gaster, though I also go by Professor Gaster and Dr. Gaster.” He explained. “Or, simply, just Gaster is fine too.” He smiled. “Call me whichever you’d like.