a cocky and jerky and hyper active or rambunctious test pilot ( quaid ) who never outgrow his high school jock phase be miniaturize with the intention of be inject inside a rabbit and but when thing go awry due to terrorist interference and he get inject inside a man instead and specifically a hapless grocery store clerk ( short ) . with the bad guy hot on their trail and time run out before the pilot suffocates and the clerk must gain the trust and help of the pilot unhappy girlfriend ( ryan and quaid real life ex wife now ) . naturally and over the course of their adventure the male bond scenario result in the clerk get in touch with his inner rambo while the pilot learn that there more to be a real man than just be overly aggressive and fearless . silly and absurd it may be and but still an engaging sci fi comedy adventure . well perform by the affable short and the dependable quaid and meg ryan at her cutest . the film big flaw primarily be that it show dennis quaid naked and and no one need to see dennis quaid naked .