The Flash: 10 Best Villains (so Far)
5. The Trickster
What's not to love about James Jesse? The character has only appeared in two episodes - one per season - but Mark Hamill's delightfully Joker-esque, over-the-top, psychotic performance quickly turned him into one of the show's most engaging antagonists.
Hamill dives headlong into the role, spouting out every one-liner and manic giggle with glee, and even without metahuman powers or the ability to take on the Flash mano-a-mano, the Trickster is undoubtedly one of the Scarlet Speeder's most dangerous foes simply due to his unpredictability, immorality, and passion for anarchy.