Plastic Manipulation – The ability to manipulate plastic.
The Nestene Consciousness (Doctor Who) likes to inhabit plastic mannequins and use them to take over the Earth. In Doctor Who – Prisoners of Time #6 (IDW), the Doctor realizes punching plastic is not effective and goes ahead and melts some autons.
A mad scientist comes up with a formula that can enlarge plastic and rubber which is unfortunate for Plastic Man in Plastic Man V1 #64 (Quality).
Cuckoo Man is frozen in plastic in Mighty Heroes #4 (Dell)! Plastic is pliable when hot not cold! I guess the writers never used a glue gun!
Molder (DC) fights Batman and Plastic Man in Brave and the Bold V1 #76.