Here is a comprehensive listing of all of the episodes from the fourth season of American game show Wipeout.

Episode 1
Winter Wipeout: Over the Big Balls to Nana's House We Go
January 6, 2011
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.

Episode 2
Winter Wipeout: The Musical
January 13, 2011
Obstacles include Mogul Madness and Yule Log Jam.

Episode 3
Winter Wipeout: Don't Fear The Beaver
January 20, 2011
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.

Episode 4
Winter Wipeout: Baby It's Blob Outside
January 27, 2011
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.

Episode 5
Winter Wipeout: Hockey Pucks And Bieber Fever
February 3, 2011
The Gingerbread House, Big Balls, the Yule Log Jam and the Wipeout Ice Arena are among the obstacles faced.

Episode 6
Winter Wipeout: This Little Piggy Went To Wipeout
February 10, 2011
Snowplow Sweeper, Wipeout Ski Lift and Holiday Hams are among obstacles faced by contestants, including the Hockey Hottie, Ripped Rhino and Mr. Grinch.

Episode 7
Winter Wipeout: Some People Just Don't Know When To Quit
February 17, 2011
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.

Episode 8
Winter Wipeout: Family Night, Kids Eat It For Free
February 24, 2011
Family teams face off against each other and take on Snow Blower, Ski Lift and Alpine Village.

Episode 9
Spring Wipeout: The Birds, The Bees And The Bed Bugs
March 17, 2011
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.

Episode 10
Spring Wipeout: Ballsy Shows Off His Giblets
March 24, 2011
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.

Episode 11
Spring Wipeout: John Henson, Zombie Hunter
March 31, 2011
Scarecase, the Banana Split, the Diving Board Spring Fling and a gladiator-theme challenge are among the obstacles faced.

Episode 12
Spring Wipeout: The Wizard Of Owws
April 14, 2011
A "Bowled Over" obstacle brings full body contact to bowling. Contestants also face the Chocolate Shop and an Arabian Nights-theme challenge.

Episode 13
Spring Wipeout: The Most Dramatic Rose Ceremony Ever
May 5, 2011
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.

Episode 14
Spring Wipeout: Dirty Laundry
May 12, 2011
Faulty Bridge, Twister Mill, Wipeout Laundromat, Scareousel and Super Tramp Challenge are among the obstacles faced.

Episode 15
Spring Wipeout: Engaged Couples
May 19, 2011
A romantic obstacle course is tackled by twelve engaged couples, who will face the Love Boat Launch, the Springivator and a Wedding Cake Testing.

Episode 16
Summer Sneak Peek
June 21, 2011
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.

Episode 17
Hotties Versus Nerds
June 23, 2011
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.

Episode 18
Let's Make a Wipeout
June 28, 2011
The Lawnmower, Big Balls, the Mood Swing and the Scareousel are among the obstacles faced.

Episode 19
At Full Tilt
June 30, 2011
The Mood Swing is tipsy, the Qualifier plays Human Pinball with contestants and the Wipeout Kitchen serves Mexican food.

Episode 20
Wheel of Misfortune
July 7, 2011
Wheel of Misfortune, Total Carnage, Wipeout Playset and Towering Flume of Doom are among the obstacles faced.

Episode 21
All-Stars
July 14, 2011
Past contestants return to face the Double Sweeper Dive and a round of Jump the Shark for a shot at $50,000.

Episode 22
You're All Acting Like Babies!
July 21, 2011
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.

Episode 23
Boss and Employee
July 28, 2011
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.

Episode 24
Ballsy Gets a Hard Hat
August 2, 2011
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.

Episode 25
Is That a Potato in Your Sack or Are You Just Happy to Wipeout?
August 4, 2011
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.

Episode 26
Bucking Broncos and Jiggling Monkeys
August 9, 2011
Bucking Broncos and hurled horseshoes, a Monkey Jiggalator and pizza served up Double Barrel-style are among the obstacles.

Episode 27
Ballsy’s Playground
August 11, 2011
The Road Trip and The Wipeout Zone are tackled by a sewer rat, a photobomber, a make-up artist and the brokenhearted.

Episode 28
Contestants Are Dropping Like Flies
August 18, 2011
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.

Episode 29
The Family That Wipeouts Together
August 25, 2011
Family duos brave the obstacles, including Double Bubble Trouble, the space-theme Double Barrel, Total Carnage and the Wipeout Playset.

Episode 30
Does This Avatar Make Me Look Fat?
September 13, 2011
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.

Episode 31
Blind Date 2.0: This Could Get Ugly
September 15, 2011
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.