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The Combine-O-Tron 2000 is an invention built by Melvin Sneedly. It has the ability to combine two things into one thing, the Combine-O-Tron 2000's effects can be reversed when the batteries are turned around.

Books 6 and 7

The children all slumped back into their seats, as Melvin pushed a plastic rolling cart to the front of the room. 

Later, Melvin grabbed his Combine-O-Tron 2000, & headed home.  after a few hours, Melvin had built his Brand-New-Super-Powered Robot, which had three sets of Interchangeable-Laser-Eye-Balls, Macro-Hydraulic-Jump-Atronic-Legs, Super-Somgobulating-Automo-Arms, & an Extendable-Octo-Claw-RibCage, & was powered by three Twin-Turbo-3000-SP5-Kung-Fu-Titanium/Lithium-Aloy-Processors, which were all built into a virtually indestructible Flexo-Grominic-Endo-Skeleton. When the Laser Extractor fired the lasers, Melvin sneezed at the last second, transforming him into the Bionic Booger Boy.   Melvin's father Gaylord Sneedly aimed the Newly Re-Configured Combine-O-Tron 2000 at his son and fired.  BLAZZZZT!  Suddenly, there was a terrific explosion.  The Bionic Booger Boy burst into three huge chunks of glistening snot and twisted metal, which smacked onto three nearby buildings and stuck like glue. In the center of the explosion, surrounded by smoke stood Captain Underpants & Melvin. The Combine-O-Tron 2000 was grabbed and destroyed by the bionic booger Trixie.

Later, Mr. Melvin, built a time machine to retrieve the Combine-O-Tron 2000 before it was destroyed. George and Harold tricked Melvin's father into giving them the device while switching it with a fake. George then zapped Gaylord with Forgetchamacallit 2000 as the confused Gaylord went back to his wife where it ended up destroyed like the original.

Returning to the future, Mr. Melvin pressed the "Start" button, on the Combine-O-Tron 2000, & suddenly, Two glowing lasers began to encode DNA on the Two elements it was about to combine.  Then, a burst of gray light shot outta' the Combine-O-Tron 2000, forming a ball of energy and Mr. Melvin & Captain Underpants, and sliding' into it and formed a gigantic glob of fleshy goo.  Finally there was a blinding' flash, & it was all over.  Later, George & Harold, return to the scene of "Big Melvin" & Captain Underpants.  Harold pulled the Combine-O-Tron 2000, out from behind him & aimed it at "Big Melvin," & Captain Underpants.  BLAZZZZT!  a blinding' flash of gray light shot outta' the Combine-O-Tron 2000, surrounding' them & SQWISHIN' them together.  George had reset the controller to combine them, transfer the super powers back to CU, & separate them.