外科医生

外 = 夕 + 卜 : There's a hole in the wall of the airplane's bathroom (ai4), and from outside (外), a bat (夕) wants to enter. Willy Walrus (w) is very afraid of bats, so he does his best to hinder the bat from entering with a voodoo staff (卜).

科 = 斗 + 禾 : In front of the elevator, Karl Marx wants to conduct one of his science experiments. He wants to condition the matador to only eat cereals until the end of his life.

医 = 匚 + 矢 : Maud Younger is floating in front of the space station and very sick. There is a doctor around, but he is floating in space too, with no way of propulsion. The medicine Maud Younger needs is stored in darts which in turn are stored in a metal box. The doctor thus throws the darts with the medicine at Maud Younger to help her.

生 = 牛 + 一 : Mnemonic symbol: a cradle.

Sherlock Holmes (sh) comforts a crying baby bull (牛) in a cradle (生) in front of the engine ((e)ng1) and plays him a tune on a flute (一).