The Seaport City 100 Drops (1970)

When her team falls onto the Chapter 6 Island, Sierra must find a way to escape with everybody making it out alive. She meets up with Scratch Silverhand and his own Monarch team. For a reason unknown to Sierra, his team is making his own version of Mechagodzilla. Now, it falls to Sierra and her team to help Scratch build the new Mechagodzilla.