* Ross Lynch as Brady, a surfer from 2013 who travels back in time to 1962 where he meets McKenzie.
* Maia Mitchell as McKenzie, a lifeguard in Malibu who travels back in time to 1962 where she meets Brady.
* Garrett Clayton as Tanner, the leader of the "Big Daddies", a surfer gang in 1962.
* Grace Phipps as Lela, the leader of the "Bikini Girls", a surfer gang in 1962.
* John DeLuca as Butchy, a member of the "Big Daddies".
* Chrissie Fit as Cheechee, a member of the "Bikini Girls".
* Suzanne Cryer as Grandma Betty, McKenzie's grandmother.
* Steve Valentine as Grandpa Augie, McKenzie's grandfather.