Knock, Knock

Season 2Episode 4030 minNov 6, 1987
Knock, Knock
When the Ghostbusters are arrested for accidentally nearly killing the Mayor's wife (June Foray) (actually just frying her dress off) the deputy police chief, O'Malley, makes a deal with them to get them out of their predicament. According to him, an ancestor of his stole a pot of gold from a leprechaun, which caused the leprechaun to curse the O'Malley family line. Every St. Patrick's Day, during a full moon, a Bog Hound rises up and seeks out the head of the O'Malley clan, which is the deputy police chief, to carry them off. The only thing that can stop the Hound is a four-leaf clover. The Ghostbusters search the city for a four-leaf clover, while Egon goes alone to try to catch the Bog Hound with 'science'. However, while Egon finds the Bog Hound at the New York City Zoo, he finds out that his proton pack is uncharged, leaving him defenseless as the Hound chases him down.
Knock, Knock has aired on Nov 6, 1987
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