Constable Zreeg was a Wrarth Warrior of the Star Council police force sent with Sergeant Zogroth in pursuit of Beep the Meep.
According to accounts where the Meep landed in 1980s Blackcastle, Zogroth and Zreeg both arrived on Earth and, with the Fourth Doctor's help, took Beep into custody. (COMIC: Doctor Who and the Star Beast)
According to accounts where the Meep landed in 21st century London, Zogroth and Zreeg were killed after explaining Beep's true nature to the Fourteenth Doctor. (TV: The Star Beast [+]Loading...["The Star Beast (TV story)"])