Prime Timeline
   | Year | 
   Event | 
   | 2359 | 
   
      
         ● [1]
         Riker is assigned to the planet Betazed. [1]
      
 
 | 
   | 2361 | 
   
      
         ● [1]
         Riker is assigned to the Starship Potempkin. [1]
      
 
      
         ● [1]
         Deanna and Riker break up. [1]
      
 
      
       
         ● [1]
         A duplicate of Riker is created during a mission to the Nervala IV. [1]
      
 
 | 
   | 2369 | 
   
      
       
         ● [1]
         The Enterprise-D visits Nervala IV, the first visit since Commander Riker led a mission there in 2361. It is discovered that a transporter accident whilst he was there created a duplicate who was stranded on the planet. The duplicate, adopting the name Thomas Riker, continues in Starfleet service. [1]
      
 
       | 
   
Colour key
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References