In the "Darkness Rising" miniseries, Optimus stated that he fought alongside one he considered a brother. He seems to be referring to Megatron and stated that his ideals became corrupted by war. In the "Masters And Students" episode, Prime states that Megatron lost his way the day he chose to become a Decepticon. However, according to the last Season 1 episode, Megatron and Orion never fought side by side. Megatron was simply a mentor to him. And he never fought side by side with Orion after he received the Matrix and became Optimus. Rather they became sworn enemies. Also, by stating that Megatron chose to become a Decepticon, it is implying that the faction already existed before he became really evil and corrupted. But it seems as if, according to the last episode, Megatron FOUNDED the Decepticons. Are the first and last episodes really contradictory or is there an alternative explanation in which everything makes sense?