Tonton Streaming Mighty Med (2013) S1E5 - Sm'oliver's Travels

Oliver uses his burgeoning medical skills at school when he performs CPR on a popular girl's poodle, which quickly elevates his social status much to Kaz's chagrin. When the popularity goes to his head, Kaz cuts Oliver down to size, literally, with a shrinking ray. Meanwhile, Horace cannot perform surgery on Citadel, an ailing superhero with an impenetrable metal exoskeleton, so shrunken Oliver is sent inside the hero's body to diagnose the problem.