What is the title of the song Dustin and Suzie sing together in season 3?

“The NeverEnding Story” is the song Dustin and Suzie sing together in season 3.

Dustin contacts his girlfriend Suzie by radio while the other characters urgently need a number to help stop the Soviet machine beneath Starcourt Mall. Suzie agrees to provide it only after Dustin sings the theme song from the 1984 fantasy film The NeverEnding Story with her.

The scene became one of the season's most recognizable musical moments because the duet continues while the other characters wait impatiently. The song was written for the film by Giorgio Moroder and Klaus Doldinger, with lyrics by Keith Forsey. The performance is not “Running Up That Hill,” which is associated with Max in season 4.