Summary: The concept of "Sentinels and Guides" has been borrowed from "The Sentinel", but this is not a crossover. This is a concept that has been applied to SGA before by several other talented authors and this is just my take on it. Sentinels and Guides are a known and accepted minority of society in this alternate universe.
Summary: Sentinels and Guides form a juvenile pair bond in childhood in order for Sentinels to survive. Neither John or Rodney formed that bond until they were older, which shocked both their parents, the academic community, and their governments.