High Quality Content by WIKIPEDIA articles! "The Erlenmeyer Flask" is the 24th episode and the first season finale of the science fiction television series The X-Files. "The Erlenmeyer Flask" introduced several new plot elements which would continue in later seasons and featured the death of recurring character, "Deep Throat" (Jerry Hardin). The episode involved FBI Special agents Fox Mulder (David Duchovny) and Dana Scully (Gillian Anderson) discovering evidence of a secret government experimentation with alien DNA, but the evidence and everyone who has seen it is quickly being eliminated.