Dark Shadows - Season 9 Episode 23 : DS-1003 1971

For a brief moment, the lives of the “real world” David Collins and Amy Jennings threaten to intersect with those of their parallel-time counterparts, Daniel and Amy Collins. The parallel versions of the youngsters happen upon a portrait of Barnabas Collins, whose presence has been kept secret by William H. Loomis. In Parallel Time, the revived Angelique, determined to find the person responsible for her death, continues to pose as her twin sister, Alexis.