Watch ‘The Simpsons’ Frank Grimes Return for 600th Episode ‘Treehouse’
The Simpsons managed to dovetail its 600th episode with Season 28's “Treehouse of Horror XXVII” this coming Sunday, and no element of the series’ history is off-limits. As such, Hank Azaria will make his long-awaited return to the role of Homer’s “nemesis” Frank Grimes, the first clip of which you can watch right now.