Season 9 Episodes10
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Ranked #3 of 9 in Season 9•+0.3 vs season avg
After moving houses, and months of strange behavior, 12-year-old Sammy stops walking and only hops; the doctors are the only hope to discover the cause of his bizarre symptoms. He is eventually diagnosed with PANDAS, a condition in which antibodies mistake his brain for Streptococcus
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"The Boy Who Only Hopped" is episode 2 of Mystery Diagnosis season 9. It scored 8.4/10 from 7 votes, ranking #3 of 9 episodes this season (season average 8.1). It aired on June 14, 2009.