If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Dr. Animo sends his mutant animals to retrieve the components for his transmodulator. Ben, Gwen and Grandpa Max know that Animo is up to something. They decide it to check io out themselves. Ben must recover the components before Animo completes his device.
Arrow Keys - Move / Choose an alien form.
Z - Enter the transformation panel.
Spacebar - Attack.