Question: During the 1968 Baltimore Colts season Earl Edwin Morrall filled in for a quarterback that was most valuable player in what years?
Sentence (from "Earl Morrall"): Earl Edwin Morrall (May 17, 1934 – April 25, 2014) was an American football player who was a quarterback in the National Football League (NFL) for twenty-one seasons.
Relevant evidence: No