This is the backstory for the Beast Wars Mutants, the only Beast Wars toy line that is not backed by the show. Mutant Beast Warriors first started to come out in April 2000, and then quickly spread to the rest of the U.S. and Canada. The Mutants introduce a new concept into the Transformers toy line; they have two beast modes, but no robot mode. To symbolize that these are transformers, however, and not morphing creatures, there are robot heads hidden in the animal bodies, and sometimes there are also little hidden mechanical details on some parts. This concept of transformers is a new challenge for Hasbro toy designers. For the other transformers, only one mode had to look like a recognizable animal or vehicle, while the other robot mode could be constructed from any "extras" or animal parts that could be connected together, and the transformer only had to be slightly humanoid in form in robot mode. Now, not one, but BOTH modes have to look like a recognizable animal. Because of the extreme challenge involved in making a transformer toy with two recognizable modes, at least one animal mode in the Mutants is a little out of proportion, or is the wrong color(s). From the backstory, one can come to a conclusion that these Mutants have formed their own side, and they are neither Maximal nor Predacon. A neat touch to the backstory is that the "anti-conversion virus" sort of ties in the stories between Beast Wars and Beast Machines, and this very same virus is probably the one Megatron used to take over Cybertron.