 Further changes occurred prior to the start of the fourth season ; executive producers Braga and Rick Berman both took a step back from the show and brought in Manny Coto as the new showrunner for Enterprise . Coto found that after he got through the Nazi story leftover from season three , he would have greater freedom to connect the series to Star Trek : The Original Series . He described that cliffhanger as one in which the characters needed to be written out of , as there was no set plan in place on how to resolve it . He made the decision to switch the story from being purely @-@ time travel based to one which featured alternate history , while resolving the Temporal Cold War , and wrote the script for both parts himself . 
