Temproids, also known as Ark Machines (or most accurately, the Mk VII Ark Unit Replicant Androids), are an evolutionary branch of Reploids produced in 4375 AD until well after 4444 AD, in response to the discovery of Tempo, a 2400-year-old Robot Master. Most, but not all, characters seen in the Megaman Tempo series are Temproids; Humans, Robot Masters, Throwbacks, Lazaroids and Meldroids also appear.