Seibertron.com Energon Pub Forums

To my knowledge, no Decepticon Leaders has outright joined the Autobot, but temporary alliances have been made to deal with a greater threat, mostly done by G1 Megatron:

- in Countdown to Extinction, Optimus Prime used Megatron in gun mode to shoot the Exponential Generator into space.
- in The Revenge of Bruticus, Megatron and optimus Prime once again joined forces to deal with the Combaticons' plot to guide the Earth into the sun.
- in The Core, Megatron joined with the Autobots again when a plan involving the Earth's Core went awry.
- another teamup happened at the end of the Marvel G2 comics, in which Megatron famously stated his foolishness with his infatuation with Starscream

- In the Japanese G2, Optimus Prime and Megatron from the Cybertron Alliance, which quickly disolved when one of Megatron's friends was killed by humans on accident.
- In a bit of a cheat, in Robot Masters Megatron used the guise of Reverse Convoy to infiltrate Autobot ranks.
- In the Stargate Battles, Optimus and Megatron again joined forces, to stop Starscream.