Alright, we've covered all the basic pets on Demonology 101, including the Felguard talent from the Demonology tree. Today we'll take a look at one of two gimmick pets that hardly see any actual play -- the Infernal. The Infernal is a pet summoned through the Inferno spell and isn't technically a Warlock pet in the traditional sense. With a 20-minute cooldown to the spell, think of it as an emergency pet like a Shaman's Elemenals.
Unlike an Elemental, however, the Infernal can be controlled with traditional pet commands but has no special abilities. Used purely for amusement purposes as the standard pets perform better in most situations, it gets even more left behind in Wrath of the Lich King as there are no new talents or abilities that make it more useful.