Air date: 2011-01-06

Runtime: 42 min

The fourth-season premiere is a winter version of the extreme obstacle course, featuring Spinning Ski Lift, Snowplow Sweeper and Big Balls with a new twist, the Snow-tivator.

Air date: 2011-01-13

Runtime: 42 min

Obstacles include Mogul Madness and Yule Log Jam.

Air date: 2011-01-20

Runtime: 42 min

Winter Wonder Planks, Ski Lift and Seven Letter Word are among the obstacles faced. Contestants include a rocket scientist, a dancer and a river guide with an extreme fear of beavers.

Air date: 2011-01-27

Runtime: 42 min

Obstacles include Snowman Sweepers; the Winter Brrr Blob, which launches contestants 50 feet in the air; the Snowtivator and Big Balls. Contestants include the Last Human, Perfect 10 and the cute and tiny Mikachu.

Air date: 2011-02-03

Runtime: 42 min

The Gingerbread House, Big Balls, the Yule Log Jam and the Wipeout Ice Arena are among the obstacles faced.

Air date: 2011-02-10

Runtime: 42 min

Snowplow Sweeper, Wipeout Ski Lift and Holiday Hams are among obstacles faced by contestants, including the Hockey Hottie, Ripped Rhino and Mr. Grinch.

Air date: 2011-02-17

Runtime: 42 min

Snowman Surprise, Yule Log Jam (where Booty Pop butts in) and Big Balls (with a dolphin impersonator chattering away) are among the obstacles faced. Contestants include Studly Student, Pretty Piggy and the Quitter.

Air date: 2011-02-24

Runtime: 42 min

Family teams face off against each other and take on Snow Blower, Ski Lift and Alpine Village.

Air date: 2011-03-17

Runtime: 42 min

Bed Bugs, Springavator, Big Balls and Trampoline Spring Fling are among the obstacles that contestants face before they are fed breakfast in the Wipeout Kitchen.

Air date: 2011-03-24

Runtime: 42 min

Flipsy Daisy, Spring Fling and Springtime in Paris are among the obstacles faced. Meanwhile, Ballsy is busy in the Wipeout Kitchen, serving up his famous giblets and other delicacies.

Air date: 2011-03-31

Runtime: 42 min

Scarecase, the Banana Split, the Diving Board Spring Fling and a gladiator-theme challenge are among the obstacles faced.

Air date: 2011-04-14

Runtime: 42 min

A "Bowled Over" obstacle brings full body contact to bowling. Contestants also face the Chocolate Shop and an Arabian Nights-theme challenge.

Air date: 2011-05-05

Runtime: 42 min

Obstacles include a troublesome Qualifier, Big Balls, a Zip Line onto the Spring Fling, the Candy Store in the Wipeout Kitchen, Scareousel and the Supertramp Challenge. One contestant promises to propose to his girlfriend if he wins.

Air date: 2011-05-12

Runtime: 42 min

Faulty Bridge, Twister Mill, Wipeout Laundromat, Scareousel and Super Tramp Challenge are among the obstacles faced.

Air date: 2011-05-19

Runtime: 42 min

A romantic obstacle course is tackled by twelve engaged couples, who will face the Love Boat Launch, the Springivator and a Wedding Cake Testing.

Air date: 2011-06-21

Runtime: 42 min

A preview of the summer session features a look at new obstacles, including the Wipeout Wall, the Flume of Doom, the Illusion-ator, Driver's Ed and the Wipeout Play Set.

Air date: 2011-06-23

Runtime: 42 min

It's hotties vs. nerds in a battle of the sexes that includes such obstacles as the Wipeout Carwash, Total Carnage and the Wipeout Play Set.

Air date: 2011-06-28

Runtime: 42 min

The Lawnmower, Big Balls, the Mood Swing and the Scareousel are among the obstacles faced.

Air date: 2011-06-30

Runtime: 42 min

The Mood Swing is tipsy, the Qualifier plays Human Pinball with contestants and the Wipeout Kitchen serves Mexican food.

Air date: 2011-07-07

Runtime: 42 min

Wheel of Misfortune, Total Carnage, Wipeout Playset and Towering Flume of Doom are among the obstacles faced.

Air date: 2011-07-14

Runtime: 42 min

Past contestants return to face the Double Sweeper Dive and a round of Jump the Shark for a shot at $50,000.

Air date: 2011-07-21

Runtime: 42 min

A socially awkward contestant, a high-school "clownselor" and a "bull-frog assassin" are served a baby-food smorgasbord and brave the sushi bar at the Wipeout Kitchen.

Air date: 2011-07-28

Runtime: 42 min

Bosses and employees team up to tackle the obstacle course as X-Ray Men, Shock Jocks and Country Club Cuties face the Caterpillar, Total Carnage and a Detour to a Race Track.

Air date: 2011-08-02

Runtime: 42 min

Total Carnage and Wipeout Carwash are among the obstacles faced by a retired rock star, a music man, a roadie, a cheerleader mom and a poker player.

Air date: 2011-08-04

Runtime: 42 min

Kindergarten Chaos (complete with flying paint and dodgeballs) and a challenge that involves wearing a potato sack and braving an elevated sweeper arm are among the obstacles faced.

Air date: 2011-08-09

Runtime: 42 min

Bucking Broncos and hurled horseshoes, a Monkey Jiggalator and pizza served up Double Barrel-style are among the obstacles.

Air date: 2011-08-11

Runtime: 42 min

The Road Trip and The Wipeout Zone are tackled by a sewer rat, a photobomber, a make-up artist and the brokenhearted.

Air date: 2011-08-18

Runtime: 42 min

Contestants are swatted like flies; take a three-wheeled driver-education test; dive into the Double Barrell; and face sea sponges, Total Carnage and the Wipeout Playset.

Air date: 2011-08-25

Runtime: 42 min

Family duos brave the obstacles, including Double Bubble Trouble, the space-theme Double Barrel, Total Carnage and the Wipeout Playset.

Air date: 2011-09-13

Runtime: 42 min

Twenty-four contestants compete against each other and the clock to make it through wild obstacle courses to ultimately be one of the final 4. The final 4 then face the Wipeout Zone. The contestant with the fastest time wins $50,000.

Air date: 2011-09-15

Runtime: 42 min

Twenty-four contestants compete against each other and the clock to make it through wild obstacle courses to ultimately be one of the final 4. The final 4 then face the Wipeout Zone. The contestant with the fastest time wins $50,000.