Dr. Mason Wren, played by J. E. Freeman, is a character in the film Alien Resurrection.
Dr. Wren is one of five scientists employed by the USM to clone the Alien Queen. After the Queen is extracted from Ripley 8, Wren conducts social experiments on Number 8 (whom he considers a predator). He discovers Annalee Call infiltrating Number 8's cell, and orders the mercenaries rounded up for execution.
They overpower the infantry and take Wren hostage, forcing him to lead them to the Betty. During an Alien attack, Wren shoots Call and escapes from his captors. He confronts the crew of the Betty aboard the ship as Larry Purvis' Alien begins to emerge from his chest. Wren shoots Purvis, who overpowers him and pulls Wren's head to Purvis' chest. The chestburster erupts through Purvis' rib cage and Wren's skull, killing them both.