Terra was given birth to by Eve after her emergency surgery after having her leg dismembered. Mark holds her after she was delivered. Mark cries after seeing Terra. She is then give to Eve to look on as they say "her life will be screwed up." While Terra is being attended to, Eve send Mark on his way. After her recovery, they go back to Eve's house with Terra. She would breasfeed Terra while they had dinner, much to her grandfather's disgust. She would put Terra to bed while they attend the funerals of Black Samson, Knockout & Kid Thor, and Cecil Stedman. Terra wakes up crying after Eve attempts to sleep with Mark. Eve would go see Immortal and Kate in their mountain hideout. She would play and leave after her parents refused to help Kate and Immortal against Robot. While she sleeps in the spaceship, Eve and Mark decide on their name, Terra, as Eve calls her "their own little piece of Earth"
Arrival to Talescria
Mark and Eve arrive to Talescria after their long trip. They are greeted by Allen in which he gets a closer look at Terra. Terra punches his eye, much to his surprise. Eve changes her diaper and the trio go to sleep on the couch. Eve puts Terra in her crib and attempts to have sex with Mark, much to his shock. Eve breastfeeds Terra while Mark is using the bathroom. Afterwards, she would put Terra back to in her crib. After an emotional revelation from Mark about Anissa, Eve goes to check on Terra, who was not breathing.
Mark had left to stop Thragg one day. He mysteriously disappeared for several years. Following Mark's return, he had thought he was only gone days but he found years had passed as Terra had the appearance of a child, as opposed to an infant when he had left.
Human/Viltrumite Physiology: Terra is a Human/Viltrumite hybrid and this gives her access to Viltrumite powers. Because humans are biologically similar to Viltrumites, this gives Terra the potential to become as strong as any pure-blooded Viltrumite. As Terra pushes herself, she can become faster, stronger, and more durable than she was before. Because of her Viltrumite heritage, Terra has the following powers:
Invulnerability: Due to her Viltrumite heritage, Terra is virtually immune to any/all kind of damage. Only beings of similar strength can actually inflict damage on Terra or even pierce her skin.
Enhanced Healing Factor: Due to her Viltrumite heritage, Invincible is immune to all diseases, disorders, imperfections, and can heal and regenerate from any injuries, even those that would normally kill Humans. Depending on how severe her injuries are, some injuries she's sustained can heal from in weeks and others take longer. Like all Viltrumites she adapts to any bodily harm as she regenerates.
Decelerated Aging: Due to her Viltrumite heritage, Terra's aging process is slower than the average Human, as she gets older her aging process will exponentially slow down further, eventually she'll stop aging. Terra can potentially live for thousands of years and will still be in her physical prime .
Dominant Genetics: Due to to her Viltrumite heritage, Terra's human genetics were overridden when she was conceived, making her more pure-blooded Viltrumite than human. 
Class 100+. As long as Terra pushes herself, she will likely become stronger than she was previously.
Vulnerable Ears: In order to achieve flight, a Viltrumite's equilibrium must be balanced. This system is located in their ears and thus anything that disrupts their inner ear function can disrupt their flight. This does not include loud sounds, but much rather certain pitch pulses. It can cause Terra's ears to bleed and possibly kill her if down for too long. This weakness has only been demonstrated on her father Mark, but it is implied that other Viltrumites share it.