Danger D'Amo, better known as The Timekeeper, is the former main antagonist of Spy Kids 4: All the Time in the World. He kidnaps Marissa Wilson to take her necklace from her, which she has entrusted to Rebecca Wilson.
His true identity is Danger D'Amo, which Cecil concluded it was an anagram that spelled Armageddon (as in the Armageddon project).
In his childhood, he was born over 70 years before this movie took place and constantly ignored his father when he told him not to touch the time machine. But alas, he went into the time machine just as his father put it on and was stuck in time. Somehow, half of his physical body moved into the future.
Every time he goes under the identity, the Timekeeper, and tried to go back in time, it works momentarily then is shoved back to the future as an older (sometimes severely wounded) version of himself, all of his minions are revealed to be himself, including his unrenamed sidekick.
Spy Kids: All the Time in the World