Tak
Tak is a female Irken presumably about the same age as Zim (Zim's age being unknown). Fifty years prior to the her first apearence in the episode "Tak, The Hideous New Girl" she was training to be an Irken invader on the Irken training planet (dont remember the planet's name) at the same time as Zim. While training in a special chamber Zim went to get a snack out of o vending machine but failed because the machine wasn't working right. To get his snack, Zim used a giant robot to blast open the vending maching. Zim got the snack, but shut down the power for that half of the planet trappin Tak within the chamber ubtil it was too late to take the test to become an Invader. Afterwords she got stuck with the job of cleaning a planet wide mess no one Irken could clean alone. Angered by how Zim ruined her life , Tak eventualy escaped somehow gained the needed supplies and set out to get her revenge against Zim by stealing his job of taking over earth, which was only to fail at the hands of Zim with help from Dib and Gaz, sending her flying into space in an escape pod from her ship that crash landed in Dib and Gaz's back yard where which Dib began to repair it for future use. Her current where abouts are unknown.