Ian Ziering will return as Fin Shepard and Tara Reid will reprise her role as April, reported Aceshowbiz.
Syfy let fans decide through a voting whether April lives or dies after the character's fate was left hanging in the balance at the end of "Sharknado 3: Oh Hell No!".
April's fate will be revealed in the next movie.
Also set to return for the fourth movie are David Hasselhoff and Ryan Newman.
Gary Busey is added to the cast as April's father Wilford Wexler, a lead scientist at Astro-X who is "at the forefront of advances in the field of robotics."
Filming is currently underway. Anthony C Ferrante returns as director with Thunder Levin once again writing the script. More cameos will be announced ahead of the film's premiere in July on Syfy.