Perhaps some of the compatible "Star Trek Online" events?
"The
Soong Foundation's science team and
Geordi La Forge worked to subvert his personality in favor of the '
Data' personality. In
2385, the group managed to unravel the
Data matrix, allowing for all of Data's memories, personality and experiences to override B4's. When Data first returned to consciousness, he refused to allow himself to exist at the expense of his brother's life. He therefore created a program in his mind to destroy his own consciousness before it destroyed B-4's. However, B-4 commandeered the program and, having heard that Data was crucial to the war with the
Undine, deleted himself before Data could stop him. Data therefore survived in B-4's body.
"Through this, Data was able to help the Soong Foundation in upgrading positronic brains and help in the recreation of the emotion chip originally developed by Doctor Soong.
Ambassador Spock likened it to his resurrection a hundred and two years previously, though Data likened it more to a return. Meanwhile, a backup copy of B-4 was saved, and thus the science team hoped to create a '
B-4 matrix', and possibly eventually bring Data's brother back to life in a new body. (
ST comic: '
Countdown, Number Two';
ST website:
The Path to 2409;
STO novel:
The Needs of the Many.)
"In
2409, Data entered a highly secure room where he activated a positronic circuit on an identical android he called 'brother'. (
STO short story: '
Unexpected Honor.')" [Memory Beta.]
Memory Alpha also notes that "the 'Guardians' story in
Strange New Worlds VII dealt with the Horta culture being transplanted to the planet where the
Guardian of Forever resided. The
Crystalline Entity visited the world almost a thousand years after the events of Nemesis and described an encounter where it was forced to destroy B-4."