Fungus usually follows Mildew, but it isn't known if he is really loyal to the grumpy old Viking.

Wherever Mildew is, Fungus isn't far behind. However Fungus does run into some trouble their including getting chased and by dragons, which got him lost, and stung by a Speed Stinger. Mildew and Fungus have moved there to get away from dragons and to find peace and quiet. In the game, School of Dragons, Mildew and Fungus are introduced into the game in the expansion called ' Icestorm Island'. Fungus is then reunited with his owner as the Outcasts celebrate their victory. This however, is an elaborate ruse so that Mildew can learn about training dragons from Hiccup so that the Outcasts can also Train dragons. Alvin the Treacherous threatens to eat lamb stew made from cooking Fungus (despite the fact that Fungus is full grown and not a lamb). In ' We Are Family, Part 2', Mildew and Fungus are on Outcast Island, seemingly as prisoners. This may suggest he cares more about his sheep, than his wives. Also in this episode, a picture of Fungus is on the wall, next to Mildew's deceased wives. In the episode, ' In Dragons We Trust', Fungus serves as an accomplice to Mildew in perpetrating vandalism to blame on the resident dragons of Berk and get them banished. Later, Fungus and Mildew watch avidly at the Arena when they think the Dragon Riders are going to get chewed out by Stoick, but finding out later that the dragon riders only get praised, Mildew is left to complain and Fungus stays to watch the riders happily. Mildew, fed up with dragons destroying his cabbage, grabs Fungus, his staff, and helmet to go complain to Chief Stoick.

Fungus makes his debut as Mildew's pet sheep in the episode, ' How to Start a Dragon Academy'.

D&d fungus race