Chelsea talks about education with actress Drew Barrymore, rapper Pitbull, and U.S. Secretary of Education John B. King Jr.; Netflix University; Chris Martin performs.

Chelsea talks lube with Gwyneth Paltrow and lobbying with Tony Hale, tests her acting chops in a telenovela, and learns the secret to an ace TED talk.

Comic book expert Amy Dallen discusses the Marvel universe; Chelsea invites "Captain America: Civil War" stars Chris Evans, Sebastian Stan, Emily VanCamp, and Frank Grillo over for dinner.

Chelsea talks tour life with Gwen Stefani, steps out with a colorful Harajuku squad, and studies the moon with NASA's ''Mohawk Guy,'' Bobak Ferdowsi.

Chelsea delves into the U.S. presidential race with comedian Wanda Sykes, former Obama speechwriter Jon Favreau and a posse of senior Florida voters.

Chelsea reaches for a big note with the Grammy-winning ''Voice'' coach and steps into the rink with a pair of Russian figure skaters.

Senator Boxer and African-American churchgoers break down what's at stake in the 2016 election. Snapchat guru DJ Khaled preaches the keys to success.

The negative impact of pornography with Gabe Deem, author Noah Church and Sen. Todd Weller: also featuring an interview with "Crazy Ex-Girlfriend" star Rachel Bloom.

The actor-turned-mogul shares investing tips and joins Cindy McCain to shed light on human trafficking. Chelsea steps out as a dog walker for hire.

Avowed non-parent Chelsea grills Kate Hudson and others about the appeal of raising kids and has her nails done by a gender-nonconforming 9-year-old.

The Science Guy weighs in on Chelsea's cryotherapy experiment and his new thinking on GMOs. "Masters of Sex" star Lizzy Caplan performs a magic trick.

MSNBC's Jacob Soboroff explains the fuss over superdelegates, and astrology maven Megan Fox tries to make sense of mixed signals in Chelsea's chart.

Chelsea dives into a grueling mud race, Will Arnett puts a new spin on Trump's tweets, and "Daily Show" favorite Hasan Minhaj talks Indian toilets.

Chelsea talks threesomes with the "Do-Over" star, waits tables with her niece, and gets the inside scoop on Melissa Arnot's historic Everest climb.

The rapper joins California Lt. Governor Gavin Newsom to push for game-changing action on pot. Chelsea tries working out stoned with an MMA fighter.

Actress Melissa McCarthy addresses fashion norms and remaking Ghostbusters. Actor Zachary Quinto discusses the first use of an LGBTQ character in the fifty years Star Trek has been in existence.

Chelsea has a lively dinner table discussion with guests from various political backgrounds.

Susan Sarandon breaks down the dramatic Dakota pipeline standoff and the #BankExit push. Gael García Bernal extols the pleasures of Mezcal and Venice.

Jennifer Aniston talks "Office Christmas Party" and her ideal superhero role. Fetty Wap explains his stance on guns. Chelsea gets high with her staff.

Kate Hudson recalls a magical holiday, LA Mayor Eric Garcetti shares his plea to Donald Trump, and Cameron Dallas and friends talk social media fame.

Common looks back on Obama's impact, country star Maren Morris marvels at her wild year, and journalist Lauren Duca dissects lies by Trump.

In the season finale, Oscar winner Jennifer Lawrence gets punchy, Chris Hardwick talks zombies, and Chelsea revisits favorite moments from the show.