Alien Gross appeared in 1973 TV series called Jumborg Ace. The Alien Gross (グロース星人 Gurosu Seijin) were aliens from Planet Gross that appeared through out the Jumborg Ace series.
The Alien Gross were a race of aliens who wanted to take over Earth. Their leaders, the Go-Ne Generals, brought monsters and cyborgs to earth in hopes of conquering it.