Episode 620

"A Critical Situation! Punk Hazard Explodes" is the 620th episode of the One Piece anime.

Short Summary
Monet was moments away from activating the self destruct button, when she felt her heart being stabbed and collapsed. At the same time Caesar Clown is shown stabbing the heart believing it to be Smoker's. The Straw Hat Pirates and their allies are still racing towards the exit of the collapsing lab when they feelthe explosion of the SAD room and then see Shinokuni on their trail. Smoker, seeing that they nearly reached safety, questions Trafalgar Law of why did he possess his heart the whole time. Trafalgar Law reveals the clever deception he played on the mad scientist, when he returned the heart of Monet to Caesar without Caesar being the wiser.

At the tanker, Baby 5's missile attack failed to take down Franky Shogun and their duel begins anew, whereas Buffalo contacts Doflamingo, to explain the situation. After confirming that the island wasn't destroyed as intended, Doflamingo decides to tend to the matter himself and is seen somehow flying over the sea towards Punk Hazard.

Anime Notes

 * When Caesar stabs Monet's heart, the hole on Monet's chest wasn't shown in the anime.
 * In the anime, Caesar stabs Monet's heart at the same time the SAD room explodes. In the manga, the SAD room explodes before Caesar stabs her heart.
 * The anime shows that Law gives Smoker back his heart after finding the rail car while the manga did not show exactly when Law returned the heart.
 * The anime adds the following:
 * After Zoro cuts a large piece of rubble blocking the passage, everyone in the rail car cheers for him.
 * The deadly gas chases after the rail car.