Identical Twins

Vincent and Kenneth Markham are identical twin brothers with opposite personalities and played by the same actor (PP). Madeline Ferguson and Laura Palmer are identical twin cousins with opposite personalities and played by the same actress. Emerald and Jade are twin sisters with opposite personalities and played by the same actress on Invitation to Love, a fictional soap opera popular in the town of Twin Peaks. (TP) Too numerous to name, nearly every principal actor on Dark Shadows plays the twin of themselves in parallel universe and historical story arcs.