FusionFallIn FusionFall, he fell when the invasion intensified in The Future. In The Past, he's at Mount Blackhead with Numbuh Three. He helps the player find and take on Fusion Tolietnator and also hands out missions. During the mission for the Mac Nano, he was much needed help when the player tries to recover Mac's bag from Fuse's monsters only to realize a gooby trap was set inside. His Fusion lies within the Dinosaur Pass infected zone found within the Darklands. The Fusion Numbuh Four secret lair is outside the infected zone near Really Twisted Forest.
- His archenemy is the Toiletnator who is also his long lost uncle.
- His real name is Wallabee Beetles.
- Fusion Numbuh Four and Fusion Numbuh Three are the only Kids Next Door fusions to not use any equipment of any kind in their boss fights.
- Fusion Numbuh One wears a gas mask and is accompanied by gas-masked fusion spawns.
- Fusion Numbuh Two uses a F.L.A.P.P.U.H to fly.
- Fusion Numbuh Five uses blasters.
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