Pajama Party (1964)

The Party Picture That Takes Off Where The Others Pooped Out!

Gogo, a Martian teenager, is sent to Earth to prepare the way for
an invasion. The first Earthling he meets, one Aunt Wendy, is a
rich widow who runs a dress shop catering to teenagers. Her nephew,
Big Lunk, is a volleyball-loving guy with little interest in romance, which
causes frustration for his girlfriend Connie. Naturally, Gogo meets Connie
and they fall in love. Meanwhile, Aunt Wendy's shady neighbor and his
gang concoct a scheme to part Aunt Wendy from her cash. Also meanwhile,
the local motorcycle gang wants revenge on the volleyball players for...
getting footprints on their beach. Somehow all the subplots come
together at the pajama party.
Written by George S. Davis