Johnny Galecki joins Justin Timberlake film

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Johnny Galecki has booked his first major feature role since becoming a star on CBS's "The Big Bang Theory."

Galecki is joining the cast of New Regency's "I'm.Mortal," the speculative sci-fi project from writer-director Andrew Niccol. Strike Entertainment is producing.

The movie, which begins shooting at the end of the month, is set in the not-too-distant future where the aging gene has been switched off. To avoid overpopulation, time has become the currency and the way people pay for luxuries and necessities. The rich can live forever, while the rest try to negotiate for their immortality.

Justin Timberlake, Amanda Seyfried and Olivia Wilde are among the cast.

In a role far removed from the one he plays in his hit CBS show, Galecki will portray Timberlake's best friend, a screw-up of a father with a drinking problem who wastes all of his family's excess time.

While this isn't the first film role CAA-repped Galecki has booked in his career – he had small parts in "Vanilla Sky" and more recently "Hancock" –  it is the first one in a major movie since "Big Bang Theory" began in 2007.