Summer's father owned a casino in Las Vegas and she always loved being an heiress. She joins Mutt and Milo on their adventure to find the Fertility Chalice before Dr. Malvina Forshaw and her Soviets do. She was likely a damsel in distress whenever she had a problem. She even has great fighting skills when she punches and kicks Soviets. In the climax, she and Mutt become mates.
Summer is likely based on Willie Scott from Indiana Jones and the Temple of Doom.