7.7/1018 votes#1 - Trial and Error
Season 8 Episode 14 - Aired 2/13/2013
Kevin deciphers the tablet and figures out how to close the gates of Hell. He tells Sam and Dean that according to the tablet one person must face a series of three tests designed by God. The first one – kill a hellhound. Sam and Dean argue over who should complete the trials.
Director: Kevin Parks
Writer: Andrew Dabb
7.3/1021 votes#2 - Bad Boys
Season 9 Episode 7 - Aired 11/19/2013
Sonny, a man who runs a boy's home, calls Dean in after a mysterious death occurs. When Sam wonders how his brother knows Sonny, Dean explains that he spent two months there when he was 16 after being arrested for theft.
Director: Kevin Parks
Writer: Adam Glass
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Kevin Parks Ratings Summary
"Trial and Error" is the best rated episode directed by Kevin Parks. It scored 7.722/10 based on 18 votes. It was written by Andrew Dabb. It aired on 2/13/2013 and is rated 0.4 points higher than their second-best episode, "Bad Boys".