Sven was the regional manager of the Land Vikings that crashed Bean's party in the Dreamland Castle. He later hooks up with Bean at the party. After learning of the Elixir of Life, Sven and his men kill (almost) all of the party guests and capture Bean, Elfo, and Luci. He then attempts to take over as the self-proclaimed "king" of Dreamland, while demanding that Bean and her friends show him the secret to immortality.
His brief reign of terror was thought to have ended when he was killed after he was dropped from the castle trapdoor by Bean, but it turns out that the Sea Trøgs dragged him underwater and used him as an incubator for their parasitic offspring.