Often, the Daleks can be antagonists. Their goal of universal domination clashes with the Doctor and Romana's efforts to protect the universe. They might be trying to steal a valuable technology or resource that the Doctor and Romana are safeguarding.
One interesting plotline could be their exploration of a strange and uncharted planet. They might encounter unique alien species and have to solve puzzles to survive. For example, they find a civilization that has a very different concept of time, and the Doctor and Romana have to adapt to it while also trying to figure out how to get back to their own time and place.
I'm not sure exactly how many are on the list you mentioned. There are quite a few, with Edgar Rice Burroughs writing many Tarzan novels over the years.
Tarzan is purely fictional. The character and the adventures associated with him were made up for entertainment. There's no historical basis or real events behind it.
Tarzan's story is purely fictional. It doesn't have any basis in reality. It's a creation that has captured people's imaginations over the years through books and movies.
Definitely not real. Tarzan is a fictional character. The story is a product of the author's imagination. It doesn't represent any actual historical or factual events or individuals.
Tarzan is indeed an original story. It introduced unique characters and settings that captured the imagination of many. The concept and plot were crafted specifically by the author and weren't based on pre-existing works to a significant extent.