Did bats ruin Halloween?
That was a key question on Scorpion Season 3 Episode 6 when the team ventured into a vast cave system to try and stop the bat population from destroying the North American ecosystem.
What perils awaited them in the cave?
Meanwhile on this addictive drama series, the team helped to stage pictures of Halloweens from Walter's past for his upcoming immigration inspection, but did they succeed?
Use the video above to watch Scorpion online to get caught up with the latest developments for the characters on this CBS procedural.
Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.