Double Jeopardy

"Double Jeopardy" is the thirtieth episode of Gargoyles, and the twenty-first single-part episode of the series.

Plot
Mysterious sightings of a gargoyle who looks and sounds like Goliath leads he and Elisa to his clone Thailog, who had been using his three "fathers" Goliath, Xanatos, and Anton Sevarius, and captures them for their wealth with which to plot human domination.