Blunderkind (2011)

in 1988 12 year old boy genius Henry Jameson sends his best friend George into the future to discover the resolution of a cliffhanger episode of the hit detective show Columbo But he loses him somewhere in time 20 years later Henry has become a degenerate alcoholic when 12 yr old George appears on his doorstep Henry is forced to overcome the loser he has become to find a way to send George back to the 80s Hilarity ensues