Question: Which American screen and stage actor, who appeared in "Casablanca" also appeared in the 1951 British-American adventure film "The African Queen"? 
Sentence (from "The African Queen (film)"): The film stars Humphrey Bogart (who won the Academy Award for Best Actor – his only Oscar), and Katharine Hepburn with Robert Morley, Peter Bull, Walter Gotell, Richard Marner and Theodore Bikel.
Relevant evidence: Yes