While he's the leader of the Decepticons, there are other evil Decepticons in the film as well, including:
* Starscream: Megatron's second-in-command and a constant schemer.
* Bumblebee: Initially a Decepticon, but he is reprogrammed and joins the Autobots.
* Frenzy: A Decepticon scout who uses sound waves as a weapon.
* Scorponok: A Decepticon warrior with a large scorpion-like tail.
* Blackout: A Decepticon who transforms into a military helicopter.
Let me know if you'd like to know more about any of these Decepticons!