So I did this on a other topic and just realized how truly ridiculous it is. Try describing this movie’s plot to a friend…this is what you COULD wind up with.
Past Lewis stopped future Goob’s plans by showing him the future (cuz Goob had gone back in to the past to destroy future Lewis’ future) Which made future Goob change his views of life. Then past Lewis went back to deal with past Goob so that the future Goob that tried to destroy His future (the one where he becomes his future self) wouldn’t exist in the first place. Which creates a Time Paradox in which since the future Goob (that was evil) never stole the time machine, or met Doris, the movie never happened and the Lewis in the past of the present Lewis will not Know to do those thongs starting the cycle into an endless loop. 
