Adventures of Sonic the Hedgehog Episode 51 - Prehistoric Sonic Episode Title:Prehistoric Sonic.Episode Description:Robotnik travels back to prehistoric times to obtain the Emerald of Life, but is once again met with interference by Sonic and Tails. However, despite their best efforts, Robotnik obtains all four Emeralds and uses them to become the Supreme High Robotnik, and then attempts to finish off his nemeses once and for all by sending them back in time to the Big Bang. The duo narrowly escape, and then gather four versions of themselves from earlier points in the timeline and successfully defeat Robotnik. Afterwords, the four extra Sonics and Tailses use Robotnik's time machine to return the Emeralds to their proper owners, and also to destroy the time machine afterwords.