Several days have passed since the Team Wartortle episode and Ash and co. can't get off the island due to strong currents. Things get worse when they are starving and they get real bad as they antagonize a trainer named Gulzar. When challenged to a battle Ash accidentally breaks Snorlax' Poké Ball and Snorlax instantly becomes "The thing that wouldn't leave". As Ash and co. arrive at the Pokémon Center the weekly food shipment is abducted by Team Rocket. Will Ash be able to soothe more than one savage beast?
Though it's eyes weren't open when it showed it, Snorlax was really mad when it got super hungry. If you look closely, you'll see glowing orange fragments in Snorlax' eyes when this happens.
The "Who's that Pokémon?" in this episode is Marowak.