Action Dexter is Dexter's Future Self as an adult. He has big muscles and can fight like a man. He is pure epic. He can operate and control weaponry which he uses to fight evil in the dark future where Overlord Mandark rules over the world.
- Jeff Bennett - English
- In Tori's Laboratory: Ego Trip he is played by Andrew.
- In Scrappy's Laboratory he is played by ???.
- In Sammy's Laboratory: Ego Trip he is played by Ichigo.
- In Dexter's Laboratory: Ego Trip (1986Movies Style) he is played by Himself.