Thanks to Zap2it we have the title and brief synopsis for the September 14th episode of Transformers Prime, "The Human Factor". See details below, but be warned it does contain spoiler- details.
Transformers Prime : The Human Factor
S02, E19(First Aired: September 14, 2012)
Silas is given a new lease on life and approaches Megatron with a plan to join the Decepticon ranks.