The last part of the Resident Evil 0 digest.
Official Transcript
The Management Training Facility had been closed down since the death of Dr. James Marcus. Parasitic leeches taking the form of humans were attacking any trespassers that entered the abandoned facility. It was true terror come to life.
The two Umbrella officers, Albert Wesker and William Birkin, were aware of the unfolding events. They were sent to recover the facility, but that plan fell apart with the endless waves of attacking monsters.
While monitoring Billy and Rebecca's progress, they began to sense a presence bent on Umbrella's destruction and decided to destroy the facility. Rebecca and Billy came to trust and rely on each other while struggling through the nightmarish circumstances. Rebecca realized that Billy did not have it in him to have murdered the 23 innocent people.
The pair eventually met with a reanimated Marcus. He told them the startling story of how he was assassinated 10 years ago.
He had just successfully replicated the T-virus after years of researching leeches when two of Ozwell E. Spencer's employees, Albert Wesker and William Birkin, assassinated him and stole his research.
The evolved leeches attached themselves to Marcus's corpse, absorbing his DNA into their own until eventually creating a copy of him.
This new Marcus sought revenge on Umbrella and the world by initiating the outbreak of the T-virus to the surrounding Raccoon Forest, resulting in a full-scale biohazard.
The copied Marcus eventually transformed into the Queen Leech while the timer began to run down on a bomb that was set to level the facility.
Rebecca and Billy knew what had to be done as the curtain on their last battle rose.