Mickey and Minnie are on a romantic dinner, but Goofy keeps interrupting.
- Mickey Mouse
- Minnie Mouse
- Horace Horsecollar (cameo)
- Clarabelle Cow (cameo)
- Lady (cameo)
- Tramp (cameo)
- This cartoon has a similar plot to the Mickey Mouse Works short "Daisy's Road Trip", where Mickey and Minnie want some time alone together, but with Daisy Duck interrupting. The differences between Third Wheel and Daisy's Road Trip is in Third Wheel, Mickey and Minnie are on a romantic dinner as opposed to going on a road trip in Daisy's Road Trip, and Goofy takes the role of the interrupter in place of Daisy.
- Running gag: When the restaurant patrons keep shushing at Mickey and Minnie for being noisy. Fortunately, this running gag is broken when Mickey finally loses his patience, ordering the patrons to "shush yourselves!".