20/25 (80%) -- maybe I should randomise 'em to make it harder.

Answers:
1: WFC/FOC, 2: War Within, 3: G1, 4: Ghost (G1), 5: Underbase
6: Zombie, 7: Pretender, 8: Action Master, 9: G2, 10: War World
11: Ghost (BW), 12: MW, 13: BWII Starscream, 14: Hellscream, 15: Armada
16: Energon, 17: Cybertron, 18: Classics, 19: Movie, 20: Animated
21: Alternity, 22: Prime, 23: Generations/IDW Armada, 24: Cloud, 25: RiD