Cold Front.Silik, the Sulmiban ennemi, uses a visit of a group of aliens on board the Enterprise to infiltrate. The ship then becomes the theater of a temporal 29th century battle whose other camp is represented by Daniels, disguised as a Starfleet crewmember. Each of them claims he must avoid the other to change the time line, or History will be destroyed. Silent Ennemy. An unknown alien ship attacks the Enterprise while returning to Earth for new equipment and weapon. Tucker and Reed do what they can to instal themselves these Starfleet phase cannons in order to defeat this ennemy that refuses any contact. And by the way, it's Reed's birthday. | 
