Hun returns to the Purple Dragons and heads a campaign hijacking weapons shipments. Leonardo’s newfound fury leads him to recruit Casey to put a stop to these thefts; however, when the two confront the Purple Dragons after a train hijacking, they encounter a foe that is a danger to all of them.
.TMNT 2005 S04-E04 “Dragon’s Brew” 1/2

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Popularity: 7%

Still recovering in the countryside, the Turtles, April and Casey take a raft down the Connecticut River. April confronts Leonardo about his newfound ire and brooding attitude. As Leo expresses his resentment and shame from his last encounter with the Shredder, they are interrupted by a fish-like humanoid creature covered in radiation burns from a nearby nuclear power plant.Which possesses April’s body and tells her of her past.
.TMNT 2005 S04-E03 “Sons of the Silent Age” 1/2

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Popularity: 9%

The Turtles go on a camping trip in the forest and explore an abandoned sawmill. Their sojourn is interrupted by an extraterrestrial mech that crashes into the nearby lake. The Turtles meet an alien, Jhanna, who is nominated to fight the corrupt Moriah in fair combat. When Moriah arrives on Earth, bringing with her an unfair advantage, the Turtles rush to Jhanna’s aid. Meanwhile at the farm, Casey struggles to express his true feelings for April.
.TMNT 2006 S04-E02 “The People’s Choice” 1/2
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Popularity: 8%

With their bodies bruised and their spirits wounded, the gang returns to the countryside to heal. Unfortunately, their recuperation is interrupted when Casey’s cousin, Sid, shows up demanding money, which he needs to repay a debt to the Purple Dragons. 

.TMNT 2006 S04-E01 “Cousin Sid” 1/2

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Popularity: 10%