An UNDERWORLD UNLEASHED tie-in issue! XS becomes trapped in the 20th century and is discovered by a Neron-empowered Chronos, who learns enough about Brainiac 5's temporal experiments to wage a battle in two eras.
XS finds herself stranded in the 20th century, unable to communicate with the locals, and against the newly repowered Chronos. The Legion in the 30th century find themselves pitted against the same foe, travelled from after his encounter with XS.
— Description from Comic Vine community (comicvine.gamespot.com).
