When Tintin and Captain Haddock arrived at Wadesdah airport in The Red Sea Sharks, Walter told a fellow accomplice to plant a bomb on their plane as he knew they would have to re-board it. However, in the animated series, Müller as Mull Pasha, planted the attempt of the bombing. He was named in Flight 714 when Spalding was talking to him on the phone to warn him that Laszlo Carreidas had invited three extra passengers. He was last seen calling Rastapopoulos saying that the the bird was heading towards the cage.
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Walter with sunglasses and binoculars, spying the heroes as seen in the animated series