"Mr. Blue" is a popular song written by DeWayne Blackwell that was a hit for the Fleetwoods, reaching number one on the Billboard Hot 100 in November 1959, giving the group its second chart-topping hit of the year. Roy Lanham played guitar on the track, and Si Zentner played the trombone.
The song are briefly featured in National Lampoon's Vacation, A Brighter Summer Day as well as in the television series Watchmen. It is also featured in the Marvel Cinematic Universe film ' (2025), in which Dr. Samuel Sterns / Leader (Tim Blake Nelson) created a form of mind controlâÂÂwhich he used on various characters, including Isaiah BradleyâÂÂby using flashes of light to plant commands into their subconscious and using the song as a trigger to activate them. Sterns previously used the name "Mr. Blue" as an alias when communicating with Bruce Banner in The Incredible Hulk (2008).