1. Mr. Lister (2008-2009):
A mysterious man named Mr. Lister arrived in Albert Square and took a keen interest in the Mitchell family's dealings. He was revealed to be a former business partner of Phil Mitchell who was out for revenge.
2. Simon Wicks (2011-2012):
Simon Wicks was a mysterious newcomer who came to Walford claiming to be the long-lost son of legendary EastEnders' character Peggy Mitchell. However, it turned out that he was a con artist with ulterior motives.
3. Nick Cotton (2012-2015):
Although not necessarily a newcomer to the square, Nick Cotton often acted in mysterious ways. He was portrayed as a villainous and unpredictable figure who always seemed to cause trouble for his family and friends in Walford.
4. Vincent Hubbard (2015-2018):
Vincent Hubbard arrived in the square with his wife Kim Fox-Hubbard and quickly became involved in questionable dealings. He was associated with a criminal underworld and had secrets from his past that eventually caught up with him.
5. Hunter Owen (2018-2021):
Hunter Owen was introduced as a troubled teenager with a mysterious background. It was later revealed that he was the son of Mel Owen, a former resident of Walford, and Steve Owen, a notorious criminal.
These are just a few examples of mysterious men who have appeared in EastEnders. Throughout the years, the show has consistently introduced characters with hidden agendas, secrets, and complex motivations, keeping viewers captivated with the unfolding storylines.