As they adjust to wild new surroundings, Mike and Charlie realize that getting to shore was the easy part. Cap encounters another explorer.

Annie and Dog stage a subterranean rescue operation. Irene gets better acquainted with the island's wildlife. Cap explains an intriguing theory.

Charlie proposes a daring plan to defeat the sea monster and save Mike's life. But it will take all his courage — and Kong's strength — to pull it off.