The stallion nicknamed Tuck one day drank from a steam and is now lives forever. He falls in love with a mortal mare, by the name of Twilight Sparkle but has to convince her to drink from the spring.

(This takes place before princess twilight, and is a pony spin of from the book Tuck Everlasting by Natalie Babbitt. The main stallion is NOT Angus Tuck or related to the Fosters or the Tucks. Go read Tuck Everlasting please to understand the plot.)