The sixth comic collection based on the hugely successful and critically acclaimed<i>Dragons: Riders of Berk</i> TV show, the spin-off of the<i> How to Train Your Dragon</i> movie.<br><br>Hiccup and the gang investigate a large pit in the middle of a forest – and they find a hostile underground tribe there… Meanwhile, Stocik faces a threat from the past – the giant sea monster, the Submaripper…