This is a story from Popeye, the original series published by Dell in 1948. The series was later renamed to Popeye the Sailor as it continued with other publishers. It has also been reprinted in other comic books by other publishers since then.
The Professor douses himself with a gas that makes him lighter than air. He flies off to find Sappo. Sappo shoots the Professor down while duck hunting because he mistakes him for a flying monster.
Last Updated: 10/16/2018