Retro Stars are a program in FIFA Mobile which gives you the opportunity to upgrade your players from earlier Programs with the new featured Retro Stars Players by completing the Retro Stars Plans.
Retro Stars Program has been added to FIFA Mobile on 6 July 2017 and is available through summer 2017. Using Fame, Throwback, and Talent Tokens, this program allows you to upgrade the older Player Program Items with upgraded stats and a new overall rating.
Retro Stars Player Items
Retro Stars Players have upgraded stats and a new overall rating. Every Tuesday evening during the Retro Stars Program, EA releases three Player Items from earlier Programs (eg. Football Freeze, Scream Team, Carniball, etc) and will give everyone the opportunity to take the original Player Item and complete a Plan to get an upgrade version of that player.
Retro Stars Plans
By completing Retro Stars Plans you will be able to upgrade your player items with upgraded stats and a new overall rating. Each Upgrade Plan will need a set number of Fame, Throwback, and Talent Tokens to complete.
Retro Stars Tokens
Retro Stars Tokens can be used to complete a Retro Stars Plan. You can earn Retro Stars Tokens by completing the Retro Stars Live Events or find them in specially marked packs. Retro Star Live Events will let you replay some of the earlier themed Live Events, such as the "Light the Christmas Tree" Event.
Here is the list of the tokens that can be used for Retro Stars Plans.