The animated show that the Turtles are watching, "Super Mech Robot Force Five", appears to be directly based on 1984's Voltron: Defender of the Universe (1984) to the American audience, which may very well be correct. However, the Voltron crew is, in turn, based on 1978's Battle of the Planets (1978) (which in turn was based on Japan's Gatchaman (1972) of 1972) while the mech robot itself is based on Japan's Great Mazinger (1974) of 1974.
The animated show Super Mech Robot Force Five, is nod to the 1984 animated series Volron.