In the manga, it states that after the first Terrafusers landed on Earth, Dexter finally came out of seclusion and teamed up with ten-year-old Ben Tennyson, Professor Utonium, Blossom, Bubbles, Dee Dee, Numbuh Five, Numbuh Two, Mac, Bloo, and his arch-rival, Mandark, to defend Foster's Home for Imaginary Friends from the Fusion Spawn invaders. History FusionFall: Worlds Collide ĭexter, Computress, and Professor Utonium

1.2 Cartoon Network Universe: FusionFall.He has constantly been creating new equipment and weapons to aid in the fight as well, and has even formed an uneasy alliance with his former nemesis Mandark. As the invasion escalated into a full-scale war, Dexter would become the leader in the war against Lord Fuse. Īfter a failed time travel experiment with the Avatar and the subsequent appearance of Planet Fusion, Dexter came out of seclusion and became a driving force behind the Earth's heroes and villains' efforts to stop Planet Fusion's invasion of the planet, being one of the first to unite them and suggest that they worked together. As his success grew, Dexter became increasingly withdrawn, with his robot assistant Computress as his sole companion. He is also the founder of the DexLabs corporation, having established it before he hit his teens. He is a human, the younger brother of Dee Dee, and a world-famous inventor. – Dexter, Cartoon Network Universe: FusionFallĭexter is a NPC in Cartoon Network Universe: FusionFall and its fan revivals.