The 44-year-old gave fans a glimpse of "Jumanji: Welcome to the Jungle," showing a "crowd-pleasing" clip that begins with four high school students in detention cleaning out the basement of their school, according to The Hollywood Reporter.
The group discovers an old video game console with the game Jumanji, which allows them to pick a character.
The game transforms the students into their chosen character and transports them to a jungle.
One "nerdy" boy is "surprised" to see he has the muscles of Johnson, while a "popular girl" is "horrified" to be in the body of Jack Black.
"Surprising the CinemaCon crowd with the world premiere first ever seen footage of #JUMANJI," Johnson wrote on Instagram prior to the convention. "Let's rock and roll and have some fun."
Copyright 2017 United Press International, Inc. (UPI). Any reproduction, republication, redistribution and/or modification of any UPI content is expressly prohibited without UPI's prior written consent.