* Elijah Wood as Sandy Ricks
* Jessica Biel as Rikki Ricks
* Terry O'Quinn as Porter Ricks
* Diane Ladd as Katherine "Kay" Ricks
* Lori Petty as Gail "Gator" Davis
* Jonathan Banks as Wayne Ricks
* Scott Schwimmer as Will Ricks
* Stephen Tobolowsky as Dr. Daniel Keller
It's important to note that the show used various dolphins throughout the series, but the primary dolphin performing as Flipper was named Mitzy.