Did Otis go for a blood test?
On Chicago Fire Season 4 Episode 21, Cruz and Brett had to get sneaky when they knew that Otis needed to find out more about his health.
Meanwhile on this crazy drama, Dawson saved a young boy from an apartment fire, but what was he hiding?
Also, Severide hit a wall while advocating for new fire masks, but did he give up?
Use the video above to watch Chicago Fire online to get up to speed with the latest drama for Firehouse 51.
Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.