The Underminer is a major antagonist who appears at the very end of The Incredibles. He is a powerful supervillain criminal, bank robber and terrorist whose ambition is to destroy peace and joy. He appears with greater roles in the spinoff video game The Incredibles: Rise of the Underminer and the later Incredibles comics by BOOM! Studios. He will return in the upcoming sequel Incredibles 2.
Near the end of the film, he appears from a gigantic drill vehicle to show his existence, prompting the Parr family to spring into action and serving to demonstrate that they will go on to have many adventures and fight various enemies as a superhero team.
The Underminer will return in the sequel. His appearance will follow on from the ending of the first film.
In the comic series, The Underminer makes an appearance in the "Terror from Beneath" story arc, in which he briefly allies with Dash to fight off alien invaders. However, the appearance is revealed to be part of an extensive hypnosis-induced dream. He later makes an actual appearance as a member of the Unforgivables, the criminal alliance headed by Xerek. As part of a plan to ruin the reputation of the Incredibles, Underminer is given control of a giant robot painted in the Incredibles' colors and rampage through Metroville. Xerek later eliminates Underminer upon completing his purpose.
Some fans speculate that the Underminer is actually Gilbert Huph (or even a possible relative of Huph's) out for revenge, (due to their similar facial features, personalities, height, hate/disregard for all mankind (Bob Parr being no exception) etc.) but its most likely not since the Underminer has mole-like teeth and just pop out of Nowhere.
Humorously, both Huph and the Underminer's respective voice actors both starred in the Toy Story series as Rex and Hamm respectively.
The Underminer (in keeping with the tradition of having most of the cast be based off of Marvel characters), is likely based on the Mole Man who was the very first known villain of the Fantastic Four.
The Underminer was planned to appeared in Disney INFINITY but was scrapped and only was seen in concept art although he does not actually appear in the game. However, customizations for buildings based on The Underminer can be unlocked in The Incredibles Playset.
The Underminer has two robotic hands. They are very articulate and have two webbed like fingers and one thumb on each hand. Whether these are used as mining equipment (As the appearance of them resemble something used for excavating), as weapons, or as prosthetic replacements are currently unknown.