|Nuclear Fusion Grenade|
|User|| Octagon Vreedle|
|First Appearance||War of the Worlds: Part 2|
The Nuclear Fusion Grenade first appeared in the episode The Enemy of My Enemy when Octagon Vreedle used it against Ultimate Kevin, but because of his lack of intelligence, he forgot to consider the fact that it had the power to destroy the entire Plumbers' Academy space station along with everyone in it.
This incident is mentioned by Rook, saying that he spent his last few days on Plumber training on an asteroid.
Ultimate Echo Echo took the bomb out into space away from the academy and let it explode there, not harming anyone.
In War of the Worlds: Part 2, Max used a Fusion Grenade. It obliterated the Hyperspace Jump Gate when Max threw it at the centre of the Jump Gate, causing to vaporize itself.