And if anyone wants to find them all, here's a list (spoiler tagged):
Astrotrain
Barrage
Detour
Dirge
The Fallen
Galvatron
Glit
Krok
Lio Kaiser
Megatron
Menasor
Octopunch
Pounce
Ramjet
Ratbat
Reflector
Scavenger
Scrapper
Skywarp
Soundwave
Tarn
Thrust
Thunderwing