Donald Duck v07 - Kingdom Under the Sea (2017)

Skindiver Donald chases a fish dinner straight into Princess Reginella's awesome subaquatic world--just in time for duck-smashing deepwater danger! Then treasure-hunting Don seeks to succeed where Viking Leif the Legendary failed! But the -Helmet of the Gods, - once worn by Odin himself, may sit a bit uneasily on our mortal duck's head...
Collects IDW's Donald Duck issues #19-21.