The Invisible Robeast
The evil witch Honerva creates her deadliest Beastman yet with an added power of invisibility! The beast attacks Fala, Shorty, Hys and Fala in the forest as the group attempts to escape. Sincline raises the stakes when he grows the invisible into a monster size to take on GoLion itself! Source: crunchyroll
Aired 26/08/1981EP 26 - The Invisible Robeast

Go Lion
Golion, a powerful sentient robot, abuses his great powers by attacking and killing creatures known as Deathblack Beastmen, boasting that no one could defeat him. A divine space being punishes Golion for his arrogance and abuse by seperating him into 5 different lion robots. In the year 1999, a group of 5 young men return to Earth after a space voyage, only to find it ravaged by nuclear war. After encountering the alien race known as the Galra, the 5 youths end up on the planet Altea, and learn that the 5 lion robots that Golion was split into are in hibernation in various parts of Altea. Somehow, they must reunite the lions and form Golion, the only hope for the human race.