International scientists study and document the ancient royal tombs beneath the ancient Mexican city of Teotihuacn
The Boundless athletes take on the punishing Ultimate Mountain Challenge, the toughest event in the multi-day Vail Mountain Games festival. Cheered on by friends and family, they complete in standup paddling, mountain biking, trail running and a road bike time trial - each race pushing the athlete's fears, injuries and endurance in ways they never expected.
Don Pietro is not happy with Genny and decides to confront him on his actions.
Ciro sets up a parley with Gennaro in order to avoid a full-on gang war. Gennaro agrees, but with strict orders from his father.
Danny disobeys a direct order from Captain Mark when he decides to give a love poem to a charter guest. Julia calls her boyfriend, while Bobby's feelings for her grow stronger. Tiffany works harder on her stew skills in hopes of Hannah noticing. On their night off, Ben is torn between two stews, but is shocked when he finds one of them in his bunk with Bryan.
Help from Luke lands Jenna an important meeting at SCU and Tamara comes clean about her money woes.
The final three artists reveal two master canvases eliminated artists return and confront each other for the first time since the competition a winner is crowned.
Todd and Julie travel to Los Angeles for a liposuction procedure, leaving Chase in charge Chase abuses his authority.
The winter crab season is here and brings with it this year's biggest storm. Every captain must decide to risk it all and head out into the storm or stay back tied to the dock losing money. However carefully they choose the best laid plans of mice and men often go awry.
Jenna has to decide between an important SCU event and her camp reunion, which leads to an even bigger choice: Luke or Matty.
Now closer than ever to uncovering the mysteries surrounding her parents, Kirstens mind is threatened when her stitch leads her deep into the recesses of her own memories.
Reese and Finch become trapped in a hospital that becomes ground zero for a deadly viral outbreak. Also, Samaritans newest recruit has second thoughts and Shaw continues to struggle with reality.
After Zoom reveals his true plan, Barry vows to do whatever it takes to stop him.
Matt Preston and Nigella Lawson arrive at the contestant house in the middle of the night as the three best from Nigella's invention test are asked to create a midnight snack for a chance at immunity.
Gordon visits a lodge in Idaho that was built by the owner's own hands before the entrepreneur lost his passion due to a family tragedy.
Root goes undercover at a radio station to protect the host of a conspiracy theory show who stumbles upon information that could get him killed. Also, Samaritans agents try to convince a member of the team that their goals are noble.
As life returns to normal, Lex moves forward with to try and reveal the truth about a possible government cover-up.
Against Vera's wishes, Ferguson is released into general. The women are out for blood but Vera confines Ferguson to her cell for safety reasons. When Ferguson challenges Vera's decision, she's left bewildered and wondering whether Ferguson has a death-wish. As always, Ferguson has an endgame but will she live to accomplish it