Sentinel Unit 2

 is a fictional robot character featured in comic book titles published by Marvel Comics. It is considered part of the mainstream Marvel Universe, colloquially referred to as the Earth-616 reality. It first appeared in Avengers, Volume 1 #103 in September, 1972 in a story titled, "The Sentinels are Alive and Well!".

Overview
is a Mark III series Sentinel. It is one of the units created at the Sentinel manufacturing facility known as the Ant Hill, located in the Australian Outback.