Release Message:  The astronauts repair the ship and take Gronk (Joe E. Ross), Shad, Mlor and Breer back home with them.

Description:  The astronauts repair the ship and take Gronk, Shad, Mlor and Breer back home with them. They leave the stone age and enter the 20th Century. Having to care for the cave family, Mac and Hector decide to conceal them in Mac's apartment. Mac and Hector try to convince NASA officials of their time travel and prehistoricl friends. General Morley makes his first appearane; the theme song is reworded to fir the new premise.