Spoiler: The Extant star is a committed trickster

By Patrick Gomez
Updated July 01, 2015 12:30 PM
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Credit: Jason LaVeris/FilmMagic

Halle Berry is not afraid to let out her inner diva – as long as it’s all in good fun.

“She had a huge temper tantrum on set. Like, massive. Like, meltdown of meltdowns,” Berry’s Extant costar Jeffrey Dean Morgan tells PEOPLE of filming season 2 of the CBS sci-fi drama with the actress.

“I wasn’t even there, but my phone was ringing like … ‘Lord, have mercy. You better get down to set right now,’ ” continues Morgan, 49.

“[She was] screaming at everyone and until the first [assistant director] started having tears coming out of her eyes. She finally was, like, ‘April Fools!’ Meanwhile everybody was like, ‘Halle Berry done lost her mind!’ ”

But Berry, 48, had actually had much bigger plans for the prank: “I was going to go much further with it, but the first AD broke into tears, so I had to stop.”

Season 2 of Extant premieres Wednesday at 10 p.m. ET on CBS.