Joel Robinson Era
| Episode | Joel's Invention | The Mads Invention |
|---|---|---|
| 101- The Crawling Eye | Electric bagpipes | Canine antiperspirant |
| 102-The Robot vs the Aztec Mummy | Airbag helmet | "Chalk Man" record and security system |
| 103- Mad Monster | Hell-in-a-handbag | Acetylene-powered thunder lizard |
| 104- Women of the Prehistoric Planet | Toilet paper in a bottle | Clay and Lars' Flesh Barn |
| 105- The Corpse Vanishes | Chiro-gyro | Flame throwing flower |
| 106- The Crawling Hand | Safety saw | Limb lengthener |
| 107- Robot Monster | Cumber-bubble-bund | Methane whoopee cushion |
| 108- The Slime People | Cartoon eyeglasses | Screaming cotton candy |
| 109- Project Moonbase | Juggling water | Insect-a-sketch |
| 110- Robot Holocaust | Nitro burning funny pipe | Stocking mask of the future |
| 111- Moon Zero Two | Teleporting food | Celebrity mouth to mouth toothpaste |
| 112- Untamed Youth | Never-light pipe | Tongue puppets |
| 133- The Black Scorpion | Giant party favor | Mads have mutated |
| 201- Rocketship X-M | BGC-19 drum machine | BGC-19 drum machine |
| 202- The Sidehackers | Joel's pet slinky | Dr. F.'s slinky body |
| 203- Jungle Goddess | Radio controlled circular saw | Dr. F.'s head is fused to a sax |
| 204- Catalina Caper | Tickle bazooka | Tank tops |
| 205- Rocket Attack USA | Candy adding machine | Water-polo foosball |
| 206- The Ring of Terror | Pin-bolus | Life-size "Operation" game |
| 207- Wild Rebels | 3D pizza | Hobby hogs |
| 208- Lost Continent | No invention | Exercise variations |
| 209- The Hellcats | Sign language translator | No invention (but they do yell NOOOOO!) |
| 210- King Dinosaur | Incredibly stinky sweat socks | The pocket scientist |
| 211- First Spaceship on Venus | Junk drawer helper | Abe Vigoda |
| 212- Godzilla vs. Megalon | Easy-to-make Halloween costumes
 |
More Halloween costumes
 |
| 213- Godzilla vs. the Sea Monster | Mind controlled guitar | Doggie chew toy guitars |
| 301- Cave Dwellers | Smoking jacket | Robotic arm wrestling |
| 302- Gamera | Endless salad bar | Bird cage vacuum |
| 303- Pod People | Monster chord
 |
Public domain karaoke machine |
| 304- Gamera vs. Barugon | Soda can animation | Disco cumber-bubble-bund |
| 305- Stranded in Space | "Bang"-gun variations | "Bang"-gun variations |
| 306- Time of the Apes | Cellulite phone | Miracle growth baby formula |
| 307- Daddy-O | Air freshener mobile | Alien teething nook |
| 308- Gamera vs. Gaos | Fax tissue dispenser | Self image printers |
| 309- The Amazing Colossal Man | Non-permanent tatoos | A plant that reviews music |
| 310- Fugitive Alien | Musical chair | Eye, ear, nose, and throat dropper |
| 311- It Conquered the World | The "Sony Seaman" | Hanged man costumes |
| 312- Gamera vs. Guiron | Collapsible trashcan
  |
Racy rorschachs |
| 313- Earth vs. the Spider | CD blow drier | Cheese phone |
| 314- Mighty Jack | Ear-shaped earmuffs | Formal flippers |
| 315- Teenage Cave Man | Rainy day epicacs | Nothing (Mads fight) |
| 316- Gamera vs Zigra | Crow-ka-bob | Three Stooges guns |
| 317- The Saga of the Viking Women and Their Voyage to the Waters of the Great Sea Serpent | Literal "Waffle iron" | Meat re-animator (for vegetarians) |
| 318- Star Force: Fugitive Alien II | The big head | Big noses |
| 319- War of the Colossal Beast | Between-meal mortar | Breakfast bazooka |
| 320- The Unearthly | Celebrity products | Hard to swallow pills |
| 321- Santa Claus Conquers the Martians | Misfit toys | Wish squisher |
| 322- Master Ninja I | Pop-up books for adults | Boil-in-a-bag IVs |
| 323- The Castle of Fu Manchu | Extremely useful phone circuit/the big head again | Joe Besser "Stinky" bomb |
| 324- Master Ninja II | Perpetual hamster habitat | Conveyor belt buffet |
| 401- Space Travelers | The dollaroid | Facial tissue |
| 402- The Giant Gila Monster | Sitcom radio | Renaissance festival punching bags |
| 403- City Limits | Mr. meat and potato head | Pop star Tupperware
  |
| 404- Teenagers from Outer Space | Scratch and sniff report cards | Resusci-Annie ventriloquist doll |
| 405- Being from Another Planet | Jack Palance impersonation kit | Tragic moments figurines |
| 406- Attack of the Giant Leeches | Insty-adolescence kit | Patches the leech |
| 407- The Killer Shrews | Jim Henson's Edgar Winter Babies
  |
The Mads try to destroy the Earth |
| 408- Hercules Unchained | The Steve-O-Meter | Decorator Roaches |
| 409- The Indestructible Man | Cereal Novels | Secret Invention |
| 410- Hercules Against the Moon Men | Super freak-out kit | Deep Hurting!
  |
| 411- The Magic Sword | Big gulp berets | Designer bio-hazard absorbent throw pillows |
| 412- Hercules and the Captive Women | The womb mate | The lawn baby |
| 413- Manhunt in Space | Recycled paper clothing | Beanbag pants |
| 414- Tormented | Aunt Catherine Wheel | Drinking Jacket |
| 415- The Beatniks | Pocket pool | Troll costumes |
| 416- Fire Maidens of Outer Space | Nike Air Chalada | Big checkbook |
| 417- Crash of Moons | Rock and wreck guitar | Sugary Deep 13 toothpaste |
| 418- Attack of the the Eye Creatures | Funny gag fax | Router Ouija board |
| 419- The Rebel Set | Abstract paint-by-number kit | Quick primp kit |
| 420- The Human Duplicators | Beanie chopper | William Conrad fridge alert |
| 421- Monster A-Go Go | Non-violent action figures | Johnny Longstorso |
| 422- The Day the Earth Froze | Snacktion | Unhappy meals |
| 423- Bride of the Monster | Microwave Faith popcorn | The tough love set |
| 424- Manos: The Hands of Fate | The cartuner | Chocolate bunny guillotine |
| 501- Warrior of the Lost World | Bittersweet Hearts | The square master |
| 502- Hercules | Instant karma | Cellular desk |
| 503- Swamp Diamonds | Android Lloyd Webber grill | U-View |
| 504- Secret Agent Super Dragon | Micro-golf | Virtual comedy |
| 505- The Magic Voyage of Sinbad | Rat Pack chess set | Chinderwear |
| 506- Eegah | Pork-orina | Replacing Frank's blood with anti-freeze |
| 507- I Accuse My Parents | Junk drawer organizer | Cake 'N' Shake |
| 508- Operation Double 007 | Sarah the bobbin buzzard | Lederhosen-hosen |
| 509- The Girl in Lovers Lane | "Don Martins" | Evil baseball promotions |
| 510- The Painted Hills | Back-talk | Cholester-do all |
| 511- Gunslinger | New whiffle items | The scanner planner |
| 512- Mitchell | Daktari stool | None (Mads are being audited) |
Mike Nelson Era
| Episode | Mike's Invention | The Mads Invention |
|---|---|---|
| 513- The Brain That Wouldn't Die | The gutter bumber shoot | The dream buster |
| 514-Teen-Age Strangler | The waiter-baiter | Frank-n-Forcer |
| 515- The Wild Wild World of Batwoman | Razor-back | Atomic powered hair dryer |
| 516- Alien from L.A. | Fridge udders | Vend-a-gut |
| 517- Beginning of the End | New playing cards | Re-comfy bike |
| 518- The Atomic Brain | The Mads | Crow and Tom Servo |
| 519- Outlaw | Fabio Kit | Really real time machine |
| 612- The Starfighters | Cowboy Mike's Red Hot Ricochet Barbecue Sauce
  |
Cranial Ports |
Note
- After Joel Hodgson left the series, Best Brains tried continuing the invention exchange for a few episodes. They were soon phased out to accommodate Michael J. Nelson's less prop-oriented brand of humor.