Gaston was a nobleman, and was in an arranged marriage with Belle, the daughter of Sir Maurice. However, when their town Avonlea comes under attack from ogres, Belle makes a deal with Rumplestiltskin to stay at his castle forever, as a maid. After some time, Gaston goes after Belle and arrives at Rumplestiltskin's castle, challenging the Dark One himself. Unworried, Rumplestiltskin transforms Gaston into a rose, later giving the rose to Belle. Belle, unaware that it is Gaston, snips the rose's stem a bit before putting it in a vase.
When Gaston learns from Hades that Rumplestiltskin is in the Underworld, he uses magic arrows given to him by Hades in an attempt to hunt down Rumplestiltskin and kill him as revenge. However, when Belle intervenes to stop Gaston from killing Rumplestiltskin, she accidentally pushes Gaston off the jetty and into the Underworld's ocean. Since it is apart of the River of Lost Souls, Gaston's dip in the ocean results in an eternity of limbo. When Hades leaves the Underworld, Gaston's fate is unclear, as souls begin to escape the River of Lost Souls.
- Gaston is based on a character from the story of Beauty and the Beast.
- After his demise at the hands of the Dark One, Gaston worked at the Underworld's version of the animal shelter. This is ironic, given how he was a hunter when alive.
- S1, E12: "Skin Deep" (flashback)
- S5, E17: "Her Handsome Hero"