Vows

"Vows" is the twenty-first episode of Gargoyles, and the sixteenth single-part episode of the series.

Plot
During Xanatos and Fox's wedding, Goliath who was asked to be the best man is attacked by Demona wielding another magical artifact; the Phoenix Gate, which she uses to send herself, Goliath, Xanatos, Fox and Xanatos' father back in time to Castle Wyvern, where Demona hopes to convince her younger self to betray her mate Goliath and change the future.