Justice League
S04E15 Terrible Leprechaun
In this episode, we meet twin leprechauns: one is kind-hearted, while the other is quite unpleasant. The mischievous leprechaun has his sights set on the treasure hidden under a defense installation in the Irish Sea. Meanwhile, his good-hearted brother is determined to thwart his sibling's plans to seize the gold. In a familiar twist, clips of Morton and Kowalski stuck in an underwater cave make an appearance from earlier episodes. As for why this episode didn't air on St. Patrick's Day, that remains a mystery.
Season 4 Episodes
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Fires of Death
The Deadly Dolls
Cave of the Dead
Journey with Fear
Sealed Orders
Man of Many Faces
Fatal Cargo
Time Lock
Rescue
Terror
A Time to Die
Blow Up
Deadly Amphibians
The Return of Blackbeard
Terrible Leprechaun
The Lobster Man
Nightmare
The Abominable Snowman
Secret of the Deep
Man-Beast
Savage Jungle
Flaming Ice
Attack!
Edge of Doom
The Death Clock
No Way Back