Yo-Yo and Keller take things public; parasitic aliens threaten the human race; and someone really needs boba.

Dominic begins to enact Madeline's cataclysmic scheme as the team rushes to stop him. Tensions rise as past secrets begin to unravel.

The team sets out on an international mission to stop an attack from spreading. Madeline attempts to turn the tables as internal conflict threatens relationships within the team.

Has Antarctica served as a home base for extraterrestrial visitors to Earth for thousands of years? As human exploration of the frozen continent increases, are we about to come face to face with both the ruins of an ancient civilization buried under the ice - and perhaps even aliens that still inhabit the frozen continent to this day?

Chinatown gathers to witness a "prize fight" between elite warriors from the Hop Wei and Long Zii. Buckley plays a bluff in hopes of getting Mercer to lower his fee. Ah Sahm remembers his roots as a fighter, as Ah Toy warns him of the dangers that await. Bill and Lee question Wang Chao about the recent series of sword killings in San Francisco.

TOP-OF-SHOW: Gov. William Weld
MID-SHOW INTERVIEW: John Waters
THE PANEL: Kirsten Powers, Jonathan Swan & Lawrence Wilkerson.

During a launch party for her hair care line, Shemekka forces Nola and Clo to hash out their problems. The earWave campaign takes a maddening turn.

When his girlfriend breaks up with him after spending the year abroad, Moritz schemes to win her back by snagging a stash of ecstasy.

Something unnatural is happening in the swamps outside Marais, Louisiana. When a mysterious illness strikes the town, CDC investigator (and former Marais native) Abby Arcane is sent to investigate. At the hospital, she encounters biologist Alec Holland who believes the bizarre illness might be connected to his scientific work in the swamp for powerful businessman Avery Sunderland. Abby has a history with Avery and Maria Sunderland, who still blames the young Arcane for the tragic death of her daughter years before. But with a deadly swamp-born virus out there, something is wrong in Marais right now. Along with Sheriff's Deputy Matt Cable, Abby once again crosses paths with Alec, but this time they encounter a terrifying, dark force that's not only killed intruders, but is also taking control of its victims. At Delroy's Roadhouse, Abby consults her old friend and local reporter Liz Tremayne who has a lead deep in the swamp. When Alec goes missing after investigating the unnatural experiments deep in the swamp, something else rises in his place: Swamp Thing, a mysterious creature born of the depths of the swamp's mystical and terrifying secrets. With nature wildly out of balance and coming for the people of Marais, in the end, it may take some Thing from the swamp to save it.

In the beginning and eleven years ago, two immortal beings decide that it might not be time to start an Apocalypse.

The shadows threaten to swallow up all certainty as Sean shuts out Lisa, and Marcos tells the truth. Angela and Todd dig into Ian's murky origins.

In the spring of 1989, five boys of color are arrested, interrogated and coerced into confessing to the vicious attack of a woman in Central Park.

On Carolina's wedding day, the Villanueva sisters are forced to face an upsetting truth about their family. Varela begins to suspect Natalia and Clara.

IR receives a distress call from the Calypso, a space vessel returning from a long mission. Scott and Virgil get aboard the plummeting ship and locate the disoriented crew along with an old robot named Braman, who sent the original distress call.

When Victor, Carla and Ash capture Elena and her friends, Naomi must trust her instincts to save them.

Applejack's plans for an orderly harvest go awry when Apple Bloom becomes obsessed with catching a magical creature she thinks can help them.

Iain steps up and offers his support to Jan. Trouble shooter Ciaran arrives in the Emergency Department. With just three months to turn things around, he is determined to shake things up, much to Connie's dismay. Meanwhile, Jacob decides to confront Jet in an effort to fight for his mother's wellbeing.