The race is on to find a new mayor. Thorne (Frances Fisher) endorses Dr. Herrera (Dean Marshall); Fargo (Neil Grayston) is backing Vincent (Chris Gauthier); and Zoe (Jordan Hinson) is campaigning for Lucas (Vanya Asher). Unfortunately, Zoe's political activism leads her to abandon her science project partner, Kylie (Margot Berner), with unexpected results. While the candidates play politics, Thorne shows Allison (Salli Richardson-Whitfield) a new chemical Zane (Niall Matter) developed. It will keep you cool under even the hottest of temperatures. Thorne professes friendship but will not tell Allison what she hopes to find in the old bunker. While Allison seeks the records that might reveal the truth, Zane and Carter (Colin Ferguson) develop old security camera footage and discover part of the secret. During an all-candidates meeting at Cafe Diem, standard civic issues take a back seat to a uniquely Eurekan problem when a second sun erupts and settles above the town. Zane and Allison quickly realize that someone created the orb but who -- and why?