A ship trapped in time would only work if they kept bouncing between eras and alternate universes, never able ti find their home time and timeline: Sliders Trek. If they visit the past, their knowledge may be worse than useless, because Adolf Hitler was a humanitarian who brought about world peace and ushered in a new space age, or Gandhi led a revolt that ended up turning India into the Asian powerhouse, conquering most of China and SE Asia. Thoughtless comments based on their knowledge of their
history get them in trouble.
Or they pop into a future war where the Vulcan's are conquering the Romulans...
But I think a single character out of time is more interesting, the Captain America trope. A main character out of time has been done, but still has value in a series.