Darlene worries about Mark making friends at his new school; Mark turns to Ben for personal advice; Becky finds herself thriving in college and starts thinking about her future plans.
Bill comes up with a solution for Kim's car desires, but the solution is only pleasing to him; Dean is worried about seeming uncool when Clisby ends up chaperoning him and his friends.
Cory worries that as the game gets more cutthroat the Vets might turn on him. Players compete in the "Sunken Intelligence" mission, where one player's lack of effort sinks their team's chances. One player's loyalty is tested by a new bond.
The Bat Team discovers that someone is using a variation of Mr. Freeze's freezing compound to experiment on freezing kidnapped people and reviving them - and Sophie's sister Jordan is the next target.
Gallo clashes with the new lieutenant temporarily filling in for Casey; Severide closes in on a dangerous and deadly arsonist.
Beverly encourages Principal Ball to establish a non-athlete senior night; Erica finds herself lacking any interested friends to appoint pre-wedding fun captain and ends up asking Geoff's sister.
When the Muldoons push to close the investigation, Ambrose refuses, pushing Sonya to the brink.
Sofia brings out Tom's adventurous side which ignites Marina's jealous side; Sarah and Denise learn that Shamiah has been confiding in Connor instead of them, leaving them no choice but to take action.
Castaways compete in their first individual immunity challenge in the game; Erika is on Exile Island for two days and must make the biggest decision in the game thus far.
Marcel helps Blake replace a patient's liver; Taylor tries to prove herself; Halstead continues to pursue the truth about Cooper; Choi gets closer to returning to life in the ED.
The tables turn as five new handsome boys enter the Villa to swoop the girls off their feet.
The Milky Way reminds us of our place in the galaxy we call home. But what shaped this giant spiral of stars and what will be its destiny? NOVA travels back in time to unlock the turbulent story of our cosmic neighborhood.
The race is on to catch Sandy's attacker before he can escape Shetland, while Lynda Morton finds herself in trouble, so she desperately calls Perez for help - offering a key name for his investigation in return. Blood from the recent break-in throws up a DNA match that leads to another murder suspect, and a shocking confession causes tensions to boil over, sowing the seeds of further violence.
Whilst helping evacuate nursing home residents, Fairbank stumbles across Mrs Atkins chattering about vital case information. As night falls, the Coopers struggle to move the evidence.
Lahela considers going with Walter on his Australian surf tour when a task at the hospital reminds her that time is precious.
Richard Sackler faces a catastrophic challenge to Purdue's bottom line, Bridget takes her fight to the FDA, Finnix reassesses his life as Betsy struggles to kick her addiction, and Rick and Randy find a bombshell piece of evidence.
Professor Brian Cox questions whether we are alone in the universe. There might be more planets than stars in our galaxy - but will we find a second Earth?
During a murder investigation at Queenstown's infamous One Lane Bridge, ambitious young Maori Detective, Ariki Davis, inadvertently reawakens a spiritual gift that endangers the case, his career and his life.