Ryan Reynolds plays a time traveling wise cracker in Shawn Levy’s science fiction adventure.

Early in “The Adam Project,” a pipsqueak asthmatic named Adam (Walker Scobell) and his golden retriever gallivant through the woods among shimmering falling debris.

Their adventure begins when the adult Adam, visiting 2022 from 2050,

explains to his kid accomplice that time travel has ruined mankind, and impeding its invention is their only hope.

Blissfully under two hours, “The Adam Project” is no modern classic.

But it does benefit from an affecting finale that pays special attention to Adam’s strained relationship with his father.

Reynolds may play the smart aleck, but beneath Adam’s zingers he is compensating for a profound pain,