Red vs Blue: Out of Body
In the present, as Washington and Carolina return from the Leader's corpse, Caboose manages to finish installing Church into Carolina's Mongoose. When Washington and Carolina study the data they salvaged from C.T.'s corpse, they find data on the alien artifact Epsilon-Church temporarily used as a body. Tucker recognizes the artifact and informs them that they had found and used it, though he claims it was a pain in the ass for them to deal with.