How essential is the "A Time To..." series?

[Deranged Nasat]

Spoiler: MAJOR SPOILERS FOR A TIME FOR WAR/PEACE, and FULL CIRCLE

I don't remember the exact details, but B'Elanna gave Kahless the mobile emitter he used to switch himself with a hologram.

Spoiler: As Above

Indeed, and we find out what Kahless was really doing sitting around on Cygnet IV while painting pictures...

 

[Rosalind]

^ ah, cool, thanks.