Hercules is trapped between their universes with Sovereign, who keeps fighting him, vindictive and feeling they stand no chance to escape, so no matter who kills the other and thus makes both worlds collapse. However trough a magical pool, they can watch Iolaus's quest. It fails to prevent Alcmene being killed, before she can give birth to Hercules, by the hordes of XEna, who conquers the world under Ares's protection. Hercules realizes their only hope is to undo that by time travel, if Iolaus realizes that Kronos's magical gem is at hand.
—KGF Vissers