Professor Groves, an expert in prehistoric life, proves his theories with an extract that'll regress a cat to a saber-tooth tiger and man to a Neanderthal.Professor Groves, an expert in prehistoric life, proves his theories with an extract that'll regress a cat to a saber-tooth tiger and man to a Neanderthal.Professor Groves, an expert in prehistoric life, proves his theories with an extract that'll regress a cat to a saber-tooth tiger and man to a Neanderthal.