Join or Sign In
Sign in to customize your TV listings
By joining TV Guide, you agree to our Terms of Use and acknowledge the data practices in our Privacy Policy.
When Delfi, the adorable yellow tang, can't find her costume, she calls on the great detective, Inspector McToothy, to help her with her search.
There are no TV Airings of Halloween Under the Sea in the next 14 days.
Add Halloween Under the Sea to your Watchlist to find out when it's coming back.
Check if it is available to stream online via "Where to Watch".