Arthur Makes Waves & It Came from Beyond

Arthur Makes Waves: The public pool is closed, but Arthur and D.W. can use James' swimming pool. Arthur discovers that James' older sister is Molly. Eventually, the two get along but avoid each other in public because their friends won't approve.
It Came from Beyond: Grandma Thora finds a stray dog named Killer. Killer is a ferocious dog that barks at and bites other people and pets. Grandma Thora finds out that Killer has been in and out of the pound several times and changes her mind after leaving Killer there. Killer rethinks her behavior toward others.