The pair will be back in the second sequel at the Television Critics Association winter press tour, reported Entertainment Weekly.
Ziering will play surfer-turned-shark-hunter Fin, and Reid, 39, will reprise her role as his ex-wife April.
The third film will be set on the East Coast with twisters hitting resorts from Washington, DC to Orlando, Florida.
'Sharknado 2: The Second One' pulled in 3.9million viewers last July which made it Syfy's most-watched original movie ever.
'Sharknado 3' will be released this July.