<Li> Mason Guccione as Alex Vreeke , a teenage boy who played , and was trapped inside , the Jumanji video game for 20 years . He is credited as `` Young Alex '' . Colin Hanks portrays adult Alex Vreeke after he returns to 1996 and appears 20 years later , changing history as a result . Out of gratitude for Bethany saving his life , he named his eldest daughter after her . <Ul> <Li> Nick Jonas as Jefferson `` Seaplane '' McDonough , Alex Vreeke 's avatar . McDonough is a mysterious guide , adventurer , and pilot in the game , who waits for and joins the other avatars as they attempt to escape Jumanji . McDonough 's strengths are piloting and making margaritas that `` Mouse '' / `` Fridge '' takes a liking to . His only weakness is mosquito bites , which is bad for him and all the more ironic since the jungle , being a tropical one , is teeming with mosquitoes . He is credited as `` Alex '' . During his twenty - year absence , only a few months have passed for him in the game world ; and in the meantime , he lives in a treehouse built and once occupied by Alan Parrish ( portrayed by Robin Williams and Adam Hann - Byrd in the 1995 film Jumanji ) . </Li> </Ul> </Li>
<Li> Mason Guccione as Alex Vreeke , a teenage boy who played , and was trapped inside , the Jumanji video game for 20 years . He is credited as `` Young Alex '' . Colin Hanks portrays adult Alex Vreeke after he returns to 1996 and appears 20 years later , changing history as a result . Out of gratitude for Bethany saving his life , he named his eldest daughter after her . <Ul> <Li> Nick Jonas as Jefferson `` Seaplane '' McDonough , Alex Vreeke 's avatar . McDonough is a mysterious guide , adventurer , and pilot in the game , who waits for and joins the other avatars as they attempt to escape Jumanji . McDonough 's strengths are piloting and making margaritas that `` Mouse '' / `` Fridge '' takes a liking to . His only weakness is mosquito bites , which is bad for him and all the more ironic since the jungle , being a tropical one , is teeming with mosquitoes . He is credited as `` Alex '' . During his twenty - year absence , only a few months have passed for him in the game world ; and in the meantime , he lives in a treehouse built and once occupied by Alan Parrish ( portrayed by Robin Williams and Adam Hann - Byrd in the 1995 film Jumanji ) . </Li> </Ul> </Li>
who played the grown up alex in jumanji
who played the grown up alex in jumanji
Colin Hanks
Colin Hanks