Originally, Sem-Re was a member of the Labor Guild on Krypton
and living in the city of Kandor
, but his status quo in life changed when Brainiac
came. He was among the survivors of the attack, only to end up as one of the many Kryptonians
to be abducted and kept in captivity by Brainiac. Commander Gor
, the de facto leader of the Kryptonian military
in Kandor, put out a call for new recruits and Sem-Re was one of those who answered.
He became an aspirant assigned to the Red Shard combat unit, a unit charged with civic defense. Twice he tested for officer training, and twice was he rejected for it.
After Kandor was liberated from Brainiac and relocated to a new planet, Sem-Re was placed under a new commander, Superman
. He immediately got off on the wrong foot with Commander El, getting caught having orchestrated a fight between Non
and a wild beast as part of Non's initiation into Red Shard.
Sem-Re's worst fear was revealed on a mission to reign in some stampeding Thought-Beasts. In his hallucination, he saw himself being sentenced to the Phantom Zone
for a crime he did not commit. Whether this was something from his past or just a fear was not revealed. Commander El helped pull him out of his hallucination and get him back on mission.