Ben and Dr. Psychobos become reluctant allies in a parallel- dimension maelstrom.
Tropes in this episode
- David vs. Goliath: Ben's response when Mad Ben turns into Way Big is to use Nanomech. He flies inside Mad Way Big's ear and fries his brain, taking down his biggest alien with his smallest.
- Hidden Depths: Ben 23 makes an impassioned speech about the responsibility of heroism, which is much more than Ben Prime was expecting from him.
- In Spite of a Nail: Despite there being no Plumber’s base on Mad Earth, Rook was still stationed there and came to know the local Ben Tennyson.
- Put on a Bus to Hell: Dr. Psychobos is left behind on Mad Earth in jail with Mad Ben while Bens 10 and 23 return to the Prime universe.
