The Glob — Annette Shelley

After an atmospheric disaster in space, a group of beings from the red dwarf star, Proxima Centauri, are faced with inevitable extermination unless they can reach earth and procure necessary food supply. Their leader, Polydorus takes the journey and crash lands in the underground shopping mall in Montreal, Quebec Canada in the dead of winter. There, he transforms himself into the suave and debonair French-Canadian, Alexandre Moreaux, and soon discovers his mission is not as easy as he'd hoped. He has to secure massive quantities of polyvinyl chloride, or plastic. When he runs into Tiffy MacDonald, he finds her both alluring and annoying.
Tiffy's got a big secret and is on the run so she willingly accompanies Alexandre on his mission.
Little do either of them know the pleasure awaiting them once they break down their defenses and learn to trust each other.