, ▁a ▁te en age ▁g nome , ▁wants ▁nothing ▁more ▁than ▁to ▁invent ▁g iz mos ▁and ▁g ad gets ▁in ▁his ▁tree - house ▁labor atory . ▁But ▁Junior ' s ▁old ▁school ▁father , ▁J alle , ▁the ▁head ▁g nome ▁of ▁the ▁forest , ▁would ▁prefer ▁his ▁son ▁follow ▁in ▁his ▁foot steps ▁and ▁one ▁day ▁be ▁in ▁charge ▁of ▁his ▁own ▁forest . ▁In ▁spite ▁of ▁their ▁differences , ▁on ▁the ▁e ve ▁of ▁the ▁first ▁winter ▁storm ▁Junior ▁helps ▁J alle ▁dist ribute ▁food ▁r ations ▁to ▁the ▁soon - to - be - hi bern ating ▁animals . ▁Then ▁dis aster ▁strik es . ▁ ▁Per pet ually ▁b ick ering ▁t roll ▁brothers ▁Face ▁and ▁S lim ▁execute ▁their ▁evil ▁father ▁F assa ' s ▁carefully ▁pl otted ▁plan ▁to ▁ste al ▁the ▁food ▁from ▁the ▁g nome ▁secret ▁food ▁chamber . ▁After ▁J alle ▁is ▁accident ally ▁injured , ▁Junior ▁and ▁his ▁best ▁friend ▁S ne ak y , ▁a ▁par ano id ▁ne uro t ic ▁crow , ▁emb ark ▁on ▁a ▁hero ic ▁journey ▁to ▁the ▁depth s ▁of ▁t roll ▁cave ▁to ▁retrieve ▁the ▁st olen ▁food . ▁Junior ▁and ▁S ne ak y ' s ▁advent ure ▁takes ▁them ▁across ▁vast ▁land sc apes ▁and ▁into ▁enc oun ters ▁with ▁b izar re ▁animals . ▁ ▁Al ong ▁the ▁way , ▁Junior ▁lear ns ▁that ▁it ▁is ▁possible ▁to ▁merge ▁his ▁passion ▁for ▁invent ing ▁with ▁his ▁new found ▁imp