History
Wal Rus is one of several animal test subjects evolved by a collection of robots. Wal Rus later joined with other test subjects in a rebellion against their machine overlords, and frequently fought alongside Ranger and Blackjack O'Hare. The rebellion's leader, Pyko, used the robots' technology to evolve Ranger into an even more dangerous soldier, and soon after did the same to his comrades despite their objections. Ranger's younger brother, Rocket, de-evolved Wal Rus, Ranger, Blackjack and Pyko back to their original state.[1]