The fourth season begins in Venice Beach, California on the Southwest course featuring the Quad Steps, Log Grip, Spinning Log, Jump Hang, Devil Steps, and Warped Wall. Veteran ninjas include stuntman Brent Steffensen, speedy Michael "Frosti" Zernow, Universal Hollywood's Dan Mast, and stuntwoman Luci Romberg, while actor William Moseley and YouTube parkour sensation Jesse La Flair take on the course for the first time.

The episode was rated 8.18 from 44 votes.

The top 30 competitors from the Midwest qualifying round tackle the finals course with a chance to move on to Las Vegas. The back obstacles featured are the Salmon Ladder, Lamp Grasper, and Cargo Climb. Favorites include Andrew Karsen, Matthew Derouen, Joshua Grant, Johnathan Morin, and Stephen Volcko.

The episode was rated 8.29 from 17 votes.

Stage 1 moves into its third episode. Favorites include Bull Bullard, Derek Nakamoto, Johnathan Morin, and Jesse Villarreal. Finishers go to Stage 2.

The episode was rated 8.30 from 10 votes.

The National Finals commence in Las Vegas, NV on a course featuring the Step Slider, Rolling Log, Giant Swing, Jumping Spider, Half Pipe Attack, Warped Wall, Spinning Bridge, and Final Climb. Favorites include David Money, Michael "Frosti" Zernow, Gunner Bahn, Marcus Ramos, and Nathaniel Spencer, among others. Finishers advance to Stage 2.

The episode was rated 8.41 from 17 votes.

The National Finals come to a close on Mt. Midoriyama's final stages. Stage 2 includes the Slider Drop, Double Salmon Ladder, Unstable Bridge, Balance Tank, Metal Spin, and Wall Lift. Stage 3 features the Roulette Cylinder, Door Knob Grasper, Floating Boards, Ultimate Cliffhanger, Bungee Rope Climb, Hang Climb, Spider Flip, and Flying Bar. If anyone reaches Stage 4 and conquers it, they'll earn $500,000 and the title of "American Ninja Warrior."

The episode was rated 8.56 from 16 votes.

The other batch of Southwest competitors tackle the qualifying course, which includes the Quad Steps, Log Grip, Spinning Log, Jump Hang, Devil Steps, and Warped Wall. Veteran Ninjas include top competitor Levi Meeuwenberg, "Twilight" stuntman Paul Darnell, and "Grandpa Ninja" Kelvin Antoine, while hotshot rookie Alex Duong and father-son duo Ron Shalvis, Sr. and Ronnie Shalvis, Jr. take on the course for the first time.

The episode was rated 8.59 from 17 votes.

Stage 1 of Mt. Midoriyama comes to a close. The 12 competitors are David "Flip" Rodriguez, David Campbell, Tim Shieff, Paul Kasemir, James McGrath, Andrew Karsen, Evan Dollard, Drew Drechsel, Jesse La Flair, Matthew Derouen, Brandon Douglass, and Luis Moco. The finishers advance to Stage 2.

The episode was rated 8.63 from 16 votes.

Stage 1 of Mt. Midoriyama continues in Las Vegas, NV. Favorites include Jake Smith, Dan Mast, Ryan Thompson, Bob Pondrom, and Ben Snead. Those who finish move on to Stage 2.

The episode was rated 8.64 from 11 votes.

Top Midwest competitors take on the tough Midwest qualifying course in Dallas, TX. The obstacles include the Quad Steps, Log Grip, Bridge of Blades, Jump Hang, Curtain Slider, and Warped Wall. Veteran ninjas include the unemployed Stephen Volcko and favorite James Hardin, while pastor Johnathan Morin and the quick Zach Sokoloski take on the course for the first time.

The episode was rated 8.69 from 13 votes.

Elite Northeast ninjas take on the qualifying course in Miami, FL. The obstacles are the Quad Steps, Log Grip, Bungee Bridge, Jump Hang, Jumping Bars, Wall Lift, and Warped Wall. Veteran ninjas include top competitor Chris Wilczewski and Travis Graves, who has something to prove, while freerunning fisherman Jesse Villarreal and rapping Noel Reyes take on the course for the first time.

The episode was rated 8.73 from 11 votes.

The top 30 competitors from the Northwest qualifying round tackle the finals course with a chance to move on to Las Vegas. The back obstacles are the Salmon Ladder, Arm Rings, and Cargo Climb (additionally, the Pipe Slider is replaced by the Devil Steps). Favorites include David Campbell, James McGrath, Patrick McGrath, Kyle Cochran, Gunner Bahn, and 51-year-old Tom Hutchman.

The episode was rated 8.75 from 12 votes.

The top 30 competitors from the Southwest qualifying round take on the finals course with a chance to move on to Las Vegas. The back obstacles are the Salmon Ladder, Arm Rings, and Cargo Climb. Favorites include Brent Steffensen, Jesse La Flair, Michael "Frosti" Zernow, Dan Mast, Kole Stevens, Evan Dollard, and Derek Nakamoto.

The episode was rated 8.75 from 16 votes.

The other batch of Northeast competitors face the Northeast qualifying course, which includes the Quad Steps, Log Grip, Bungee Bridge, Jump Hang, Jumping Bars, Wall Lift, and Warped Wall. Veteran ninjas include freerunning champion Tim Shieff and Bay Area stuntman Luis Moco, while 5'5" Michael Needham and firefighter Mike Bernardo take on the course for the first time.

The episode was rated 8.82 from 11 votes.

The other batch of Northwest competitors take on the qualifying course that features the Quad Steps, Log Grip, Spinning Log, Jump Hang, Pipe Slider, and Warped Wall. Veteran ninjas include freerunner Brian Orosco and ice cream vendor James McGrath, while his brother Patrick McGrath and Alaskan native Gunner Bahn take on the course for the first time.

The episode was rated 8.85 from 13 votes.

Top contenders from the Northwest face off against the Northwest qualifying course, featuring the Quad Steps, Log Grip, Spinning Log, Jump Hang, Pipe Slider, and Warped Wall. Veteran ninjas include "the Godfather" David Campbell and the colorful Ryoga Vee, while type-1 diabetic Kyle Cochran and top female competitor Janine Cundy take on the course for the first time.

The episode was rated 8.85 from 13 votes.