Radical Rex review. Classic Game Room presents a CGRundertow review of Radical Rex for the SEGA Genesis developed by Beam Software and published by Activision. Unaware that it would eventually happen anyway, mammals are trying to get rid of the dinosaurs and take over the world. Radical Rex has something to say about that. He’s a fire-breathing therapod with attitude and a skateboard, and he’s off on a prehistoric adventure. Join him through five levels of Jurassic-sized platforming! This video review features video gameplay footage of Radical Rex for the SEGA Genesis and audio commentary from Classic Game Room's Derek.