Dalby was the assistant of Otto Martens, a professor alongside him. Dalby's actions inadvertently thawed out and released the frozen Reptilicus.
Later, after hearing something, the inquisitive Dalby ventured out into the hallway to check on the tail. Seeing a huge shadow moving along the walls of the tank room, the fearful professor runs back to the lab to call for help. The phone lines however, are dead, and Peter instructs Peterson to get law enforcement.Dalby would arm himself and return to the tank room with the Reptilicus, to which the monster would escape and attack him, resulting in his implied death later, as Otto finds his ruined glasses.