Dennis the Gardener (surname unknown), more commonly known as "Dungo" or "Dungo Dennis", is an unseen yet pivotal character in the Red Dwarf universe. Around the mid-22nd Century, Dungo was employed to maintain the botanical gardens of the Rimmer family home on Io. Mrs. Rimmer was known to be quite promiscuous and had numerous affiars, and Dungo was one of her many lovers. In 2149, Arnold Rimmer was born to Dungo and Mrs. Rimmer. Although Mr. Rimmer seemed aware of the fact, he raised Arnold as his own, but always with a resentment not far from the surface. As a boy, Arnold remembered Dungo as a "babbling imbecile".