1) A lion catches a mouse in his paw while napping but decides to spare it after the mouse promises to help him someday. 2) Later, the lion gets caught in a hunter's net and calls for help. The mouse hears the lion's cries and remembers promising to help him. 3) The mouse gnaws through the ropes of the net, freeing the lion. The lion thanks the mouse for proving that even small creatures can help large ones.