Watch Top Gear: The Challenges for Free: How to Stream the Movie Online at 123Movies. . Featuring the most ludicrous stunts ever undertaken on TV. Top Gear doesn't do things by halves, which is completely apparent in Top Gear: The Challenges. Not only does the team attempt to drive on water, send a car into space and race a bunch of jumping French men... only to lose, they also manage to embroil several celebrities.